2008 s600 catalytic delete
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1983 Nissan Shltbox
MBWorld Fanatic!
Joined: Aug 2021
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1983 Nissan Shltbox
Here ya go. I have a lapel mic but it still doesn't do justice in the audio department. If you've got a nice stereo, or headphones, or play in your car or something, there is quite a bit of bass and turbo noise for ya'll 
IRL it's so loud! Can't wait to get my 3" exhaust finished. The first iteration will be 21" resonators only, dumping just aft of the rear wheels.
IRL it's so loud! Can't wait to get my 3" exhaust finished. The first iteration will be 21" resonators only, dumping just aft of the rear wheels.
Member
Joined: Dec 2021
Posts: 179
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From: Nyc
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Wow, that's uncomfortably loud. I learned straight pipe exhaust is not for me while building nissan 240sx. There are 3 things I absolutely hate when modifying a car. Solid motor mounts, racing exhaust or straight pipe, and coilovers that are too stiff. I like to keep my internal organs, my hearing, and my spine just the way they are. Idk how people drive in cars that bounce all over the place. Going over bumps or potholes will really do a number on your spine if your suspension is too stiff. I was going to buy the catless downpipes but my transmission started to slip. Now the downpipes are gonna have to wait. Thanks for the video. It was very informative
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1983 Nissan Shltbox
Yep, it's pretty loud. Exhaust is not complete. Just waiting on parts to convert it from the current 2.5" to a 3" system from the downpipes back. I want a much lower frequency exhaust note. Gonna be awesome! Should be a week or so.
And yeah, the price people want for M278 downpipes is stupid. But they'll get it because there's just no demand for them. People don't do what I'm doing to this car. Pretty rare.
Edit: I feel like we've hijacked the OP's thread, but ah well! The plan is 21" resonators only with 3" system from termination of downpipe kit-back. No mufflers. System will terminate just behind the rear wheels and 45 degree down and to the side. Not straight out the back.So stay tuned!
And yeah, the price people want for M278 downpipes is stupid. But they'll get it because there's just no demand for them. People don't do what I'm doing to this car. Pretty rare.
Edit: I feel like we've hijacked the OP's thread, but ah well! The plan is 21" resonators only with 3" system from termination of downpipe kit-back. No mufflers. System will terminate just behind the rear wheels and 45 degree down and to the side. Not straight out the back.So stay tuned!
Last edited by Senecat; Jun 28, 2025 at 11:22 AM.
Member
Joined: Dec 2021
Posts: 179
Likes: 30
From: Nyc
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Are the downpipes 3 inch? I was just thinking isn't having two 3 inch pipes a bit mush? Then I remembered in all of my 240sx's I've owned had full 3 inch exhaust from the turbo back and those were 2.0l turbo. When your exhaust sits 1.5 inches below the frame rails and the cars dropped, hitting potholes sucks! I don't think too many people these days go out and have an exhaust system built for them like what you're doing. It's so cheap to do too. I've had a custom 3 inch exhaust in my vanmade for me at midas. I paid $120 for the flow masters muffler, $40 for two 4.5×10 inch exhaust tips, and 250 for the work. They supplied the piping. It was pretty badass. I had the tips come out of the sides right behind the rear tire. Now you got me thinking if I should keep the stock exhaust in my m275. Are you building the exhaust yourself? Please make a video when you're done with the exhaust. I can't wait to hear it
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1983 Nissan Shltbox
So yes, I am building the exhaust myself. I have done all the thinking and am just waiting on components and tools (tubing expander). I have planned this so that it can be completely reversed. I have not chopped up the factory system at all. And the other cool thing about my process, is that there are no welds or butt joints. Expanded female tubing ends will slide over un-expanded male tubing ends and be clamped. So if I don't like it, or want to try something else, or want to play with the sound tuning with resonators and tubing diameter, I can redesign and build out another system on the cheap and by myself. And someday if I ever get tired of it all, I can toss the factory system back in and no one would ever know any of this happened. Also, I put vinyl caps on the vacuum lines that actuate the factory muffler valves and have seen no codes.
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Member
Joined: Jan 2018
Posts: 109
Likes: 92
2006 S350L
It will smell horrible, and with that much displacement you'll really be harming the environment.
My disdain for those eco-green idiots is very strong, but running a motor that large without catalysts is not a good idea, even for me.
MBWorld Fanatic!
Joined: Aug 2021
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1983 Nissan Shltbox
You boomers had it better in literally every single metric than ANY other generation in human history at the financial EXPENSE of X and millennial, and hell, every other foreseeable succeeding generation now chained with the national debt you boomers voted us into for the rest of our lives to fund your welfare, I mean "entitlement" programs for the rest of YOUR lives while we can't even afford to buy a house anymore, let alone have kids!
For every pissy fit you throw over not having cats, I'm going to do a burnout! Stuff it, boomer!
/endrant
Member
Joined: Jan 2018
Posts: 109
Likes: 92
2006 S350L
lol
I'm 40
no boomer here
Boomers were able to go to banks and get insane loans with near zero interest.... that wasn't us for sure!
I drove a BMW 740i with hollowed cats for about a month 15 yrs ago, smelled horrible and I replaced them
Also the loss of torque was unacceptable
I'm 40
no boomer here
Boomers were able to go to banks and get insane loans with near zero interest.... that wasn't us for sure!
I drove a BMW 740i with hollowed cats for about a month 15 yrs ago, smelled horrible and I replaced them
Also the loss of torque was unacceptable
MBWorld Fanatic!
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1983 Nissan Shltbox
lol
I'm 40
no boomer here
Boomers were able to go to banks and get insane loans with near zero interest.... that wasn't us for sure!
I drove a BMW 740i with hollowed cats for about a month 15 yrs ago, smelled horrible and I replaced them
Also the loss of torque was unacceptable
I'm 40
no boomer here
Boomers were able to go to banks and get insane loans with near zero interest.... that wasn't us for sure!
I drove a BMW 740i with hollowed cats for about a month 15 yrs ago, smelled horrible and I replaced them
Also the loss of torque was unacceptable
And yes, I'm notably down on power with this exhaust and no tune. This is expected. But man it's fun to drive when you can hear it! Brings back memories...
Member
Joined: Dec 2021
Posts: 179
Likes: 30
From: Nyc
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
You lost torque because you're car wasn't turbo. I would never remove cats on a N/A car. You lose all the low end torque without back pressure. A long time ago my friends bought a Mitsubishi eclipse non turbo. I had him buy every bolt on part they sold for that car. After everything was installed, the car was slow as ****. I learned that advertisers just make up random stuff to sell thier products. Im 45 btw
MBWorld Fanatic!
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1983 Nissan Shltbox
The pull at 8:30 was for you!
That was from about 50-120mph. Not too shabby but still far shy of what is coming once I sort out all this tranny crap and get the intake, exhaust and tune to 100%. After all that then I'll have to TCU tune anyway, so I'm wondering if I should just do that first??????
Going to a meeting soon and will take the car and GoPro. I will get a better angle on the Gopro this time and do some more pulls. This way you can see on the dash that I'm a "super-speeder!" (New law in Florida just passed, I go to jail for 30 days if caught speeding <50mph over posted or above 100mph. Awesome!)
https://mynews13.com/fl/orlando/news...er-speeder-law
That was from about 50-120mph. Not too shabby but still far shy of what is coming once I sort out all this tranny crap and get the intake, exhaust and tune to 100%. After all that then I'll have to TCU tune anyway, so I'm wondering if I should just do that first??????
Going to a meeting soon and will take the car and GoPro. I will get a better angle on the Gopro this time and do some more pulls. This way you can see on the dash that I'm a "super-speeder!" (New law in Florida just passed, I go to jail for 30 days if caught speeding <50mph over posted or above 100mph. Awesome!)
https://mynews13.com/fl/orlando/news...er-speeder-law
Member
Joined: Dec 2021
Posts: 179
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From: Nyc
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Does the turbo kick into full boost sooner with the catless downpipes and open exhaust? Honestly idk if i wanna drop any more money on my w220 s600. The car is just way too heavy. At 4300lbs I'd need 1000hp to break into the 10 seconds. With the stock turbo and injectors I believe 650hp is the most i can get out of my s600. It would cost me probably over 10k to get to 1000hp. It would cost me way less to get my 240sx to 10 seconds. 2500lbs vs 4300lbs is a huge difference
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1983 Nissan Shltbox
You're M275, so very similar configuration. Our turbos hang directly off the exhaust manifolds as proximal to the block as mechanically possible to reduce lag. I've never noticed a lag issue with the M278, but I don't have much experience with any other vehicle with a turbo/s from other manufacturers. I get brake-boosting and all that for other cars, but for ours, I just don't think there's any lag more than can be expected from any optimized vehicle in terms of the time it takes for the charge side time to pressurization. There is no exhaust-side time-to-pressurize as the exhaust gasses go directly from the combustion chamber into the hot side of the turbo. There's just no distance there to need time to pressurize.
I don't know about M275 tuning, but I would imagine it wouldn't take much to get that V12 biturbo close to 1khp. Also, your W220 is a bit lighter than the W221. Depending on how dressed out they are, the W221 clocks in at/around 5,000lb's!
I don't know about M275 tuning, but I would imagine it wouldn't take much to get that V12 biturbo close to 1khp. Also, your W220 is a bit lighter than the W221. Depending on how dressed out they are, the W221 clocks in at/around 5,000lb's!
@Senecat I can't believe I missed all your exhaust posts. Sounds great bro! I have the S63 full exhaust on mine but it does not sound anything like yours. I am thinking of doing a stage 1 tune on mine soon and can also add the exhaust popping as well. Will see how that goes..
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1983 Nissan Shltbox
@Senecat I can't believe I missed all your exhaust posts. Sounds great bro! I have the S63 full exhaust on mine but it does not sound anything like yours. I am thinking of doing a stage 1 tune on mine soon and can also add the exhaust popping as well. Will see how that goes..
My goal is to tune out much of the high-pitched frequencies with the resonators, and drop the overall frequency by going from 2.5" to 3" out the sides just aft of the rear wheels with this stuff:
Member
Joined: Dec 2021
Posts: 179
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From: Nyc
S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
Yes, you're right. The turbos are so small that there's no real turbo lag. I thought the 4300lbs was bad but 5000lbs is crazy!
There's a few issues with reaching 1000hp in the m275. The injectors are too small. The 5.5l has 340cc injectors while the 6.0l has 443cc injectors. I would need 600cc injectors to safely push 1000hp. Turbo size is another issue. Idk if it's true but supposedly the s65 has a larger turbo. It can't be that much larger since there's no room in the engine bay. Renntech tune for the s65 and minor mods is 700hp for the s600 with minor mods is 650hp. Now with the 340cc @58psi (4bar) hp limit is 673 and the 443cc @58psi hp limit is 887. So I'm guessing on the s600 they stopped tuning because of injector limit and the s65 hit the turbo limit. Without doing a bunch of work upgrading the turbos I think 700hp is about the limit. Im currently around the 650 range. I installed a manual boost controller and I turned the boost up as high as I could go. I could probably get a few more psi if adjust the wastegate arms but that's about it. Im at the limit. I got a meth injection kit but it won't do me any good if I can't increase the boost
There's a few issues with reaching 1000hp in the m275. The injectors are too small. The 5.5l has 340cc injectors while the 6.0l has 443cc injectors. I would need 600cc injectors to safely push 1000hp. Turbo size is another issue. Idk if it's true but supposedly the s65 has a larger turbo. It can't be that much larger since there's no room in the engine bay. Renntech tune for the s65 and minor mods is 700hp for the s600 with minor mods is 650hp. Now with the 340cc @58psi (4bar) hp limit is 673 and the 443cc @58psi hp limit is 887. So I'm guessing on the s600 they stopped tuning because of injector limit and the s65 hit the turbo limit. Without doing a bunch of work upgrading the turbos I think 700hp is about the limit. Im currently around the 650 range. I installed a manual boost controller and I turned the boost up as high as I could go. I could probably get a few more psi if adjust the wastegate arms but that's about it. Im at the limit. I got a meth injection kit but it won't do me any good if I can't increase the boost
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From: Phoenix
222 S-65
Hank... Much of what MB does with programming is trying to keep the turbo motor from becoming a grenade.
Boost is cut with high intake air temperatures. Water/Methanol injection reduces intake air temps and makes it less inclined to ping.
Denser intake charge means more power per pound of boost with increased safety margin. Fit the water/Methanol injection kit.
MB put bigger turbos in the S-65. Bigger still for SL65 black series that makes 660HP as standard.
I have a friend who builds turbos. He speaks of different wheels and other mods to S-65 that will still have headroom at 1000HP.
I gently suggest you start with the six liter engine though. 221 S-65s can be had affordably these days.
Boost is cut with high intake air temperatures. Water/Methanol injection reduces intake air temps and makes it less inclined to ping.
Denser intake charge means more power per pound of boost with increased safety margin. Fit the water/Methanol injection kit.
MB put bigger turbos in the S-65. Bigger still for SL65 black series that makes 660HP as standard.
I have a friend who builds turbos. He speaks of different wheels and other mods to S-65 that will still have headroom at 1000HP.
I gently suggest you start with the six liter engine though. 221 S-65s can be had affordably these days.
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1983 Nissan Shltbox
Asking for 1k hp from anything is going to cost a bit of money and research. I can't say I've seen or heard of any M275 equipped vehicle reaching that mark, but I have certainly seen evidence that even a bit under that number didn't seem to bother it wasting everything else on the street.
