Opinions needed. Which tune (M157) - OE or EuroCharged?
The car did pick up some mid range HP and TQ! Top end is similar.
Did a dyno run right after the cat delete and re-flash!
I've been told that the car need to re-adapt/relearn after the tune?
Iron Sheik
The car did pick up some mid range HP and TQ! Top end is similar.
Did a dyno run right after the cat delete and re-flash!
I've been told that the car need to re-adapt/relearn after the tune?
Iron Sheik
I got a question for you guys. If you remove the cats, wouldn't you fail inspection and consequently not be able to drive on the road without inspection? Or do you put the cats back up and then pass inspection, then remove it again? Also, is it worth it to decat my cls63 if I get only little hp gains? Also, you guys must be addicted to very loud noise because stock (especially during cold start) the car makes a good amount of noise which is music to my ears lol
I got a question for you guys. If you remove the cats, wouldn't you fail inspection and consequently not be able to drive on the road without inspection? Or do you put the cats back up and then pass inspection, then remove it again? Also, is it worth it to decat my cls63 if I get only little hp gains? Also, you guys must be addicted to very loud noise because stock (especially during cold start) the car makes a good amount of noise which is music to my ears lol
we also have a motor protection warranty, have done over 25,000 cars, and have locations all over the world to better serve our clients!
Ironsheik has raised an important issue. He believes that once you start getting into the 700hp plus mark, the transmission may start slipping (Which was also part of my concern). Does the EC tune have an additional transmission tune software that controls how the transmission will perform with these drastic increase in HP and torque or is the transmission controlled by the ECU and your tune files are able to control the transmission for massive amounts of torque?
The Best of Mercedes & AMG




As far as discounts/sales and such, trust me that AMS will match pricing from any of these other guys. Not that I have ever had a tuned ECU or plan on getting one.

Good Luck
+1000 on ams
And AMGboy, definitely delete your cats if you have the burble feature. You are not getting the full performance of your car.
My car woke up after the cat delete. It was breathing better.
Iron Sheik
ive been having problems with my catalyst monitor due to not getting enough airflow and I have a burble tune so my cats are probably clogged. I am ready to get rid of them
as far as visual inspection, you would need to put your cats back in but to workaround all of this I am probably going to gut my OEM cats and get a retune. It will pass visual inpspection and obd2
i have no interest In paying $1500+ for metal pipes with 02 bungs just to get a 25-35hp gain that can be had for much cheaper. Also downpipes would require swapping back to stock for smog, in my opinion that’s too much work. Rather gut the cats they do no good for our engines
Unfortunately a problem I’m dealing with in CA is all my usual exhaust shops are refusing to touch or remove my cats because the law has been cracking down on these shops. I’m probably gonna end up doing the job myself (gutting then) but if anyone is good friends with exhaust shops just have them fabricate downpipes for you and it’ll be a fraction of the price




i live in Cali as of right now they are only doing OBD testing and checking the monitors
ive been having problems with my catalyst monitor due to not getting enough airflow and I have a burble tune so my cats are probably clogged. I am ready to get rid of them
as far as visual inspection, you would need to put your cats back in but to workaround all of this I am probably going to gut my OEM cats and get a retune. It will pass visual inpspection and obd2
i have no interest In paying $1500+ for metal pipes with 02 bungs just to get a 25-35hp gain that can be had for much cheaper. Also downpipes would require swapping back to stock for smog, in my opinion that’s too much work. Rather gut the cats they do no good for our engines
Unfortunately a problem I’m dealing with in CA is all my usual exhaust shops are refusing to touch or remove my cats because the law has been cracking down on these shops. I’m probably gonna end up doing the job myself (gutting then) but if anyone is good friends with exhaust shops just have them fabricate downpipes for you and it’ll be a fraction of the price
And now my 2015 is clear until 2019. So I guess they changed the process. But like you say, you still need to pass visual and they only way to do that is 2 exhaust systems or gutted cats.
Minimal power to be had, the smell, and the cost to re-tune ( shut off secondary 02 monitoring), labor for install and catless pipes. For some more noise?
No body really knows what tune is good or not as all there is a bunch of accounts of dynos and butt dyno reviews. There is no real data on this forum and what is what. So the one that throws CEL is least is the winner haha
Minimal power to be had, the smell, and the cost to re-tune ( shut off secondary 02 monitoring), labor for install and catless pipes. For some more noise?
No body really knows what tune is good or not as all there is a bunch of accounts of dynos and butt dyno reviews. There is no real data on this forum and what is what. So the one that throws CEL is least is the winner haha
Plus who will want to spend $800 plus dollars for some 20hp and lots of noise (but going nowhere fast) or actually spend $1000 on a tune and get 120hp + and burn almost any car on the road?
Minimal power to be had, the smell, and the cost to re-tune ( shut off secondary 02 monitoring), labor for install and catless pipes. For some more noise?
No body really knows what tune is good or not as all there is a bunch of accounts of dynos and butt dyno reviews. There is no real data on this forum and what is what. So the one that throws CEL is least is the winner haha
catless on any turbo car adds power and improves throttle response. Granted it’s not substantial, it yields benefits for sure and helps overall longevity of the car. The sound is a bonus. If you keep the cats in they will go bad eventually and those will cost you a lot to replace. That’d be a good time to delete them. But seriously removing cats on any turbo platform undoubtedly yields gains and it’s a mod almost anyone whose serious power does. It’s not a huge amount of power so it won’t make or break your build if you don’t but you shouldn’t overlook the benefits. Also 02 monitoring is literally only for emissions and has no effect on the engines life or power
there’s people with over 1000hp that aren’t doing much better in 1/4 miles due to other limiting factors.
but the increase in turbo spool, throttle response, and power is noticeable to the driver and as mentioned above proven on the dyno but 20-30 whp is probably not gonna translate into a significant difference in track times that’s a given. Also there cars aren’t necessarily made to be 1/4 mile cars
catless on any turbo car adds power and improves throttle response. Granted it’s not substantial, it yields benefits for sure and helps overall longevity of the car. The sound is a bonus. If you keep the cats in they will go bad eventually and those will cost you a lot to replace. That’d be a good time to delete them. But seriously removing cats on any turbo platform undoubtedly yields gains and it’s a mod almost anyone whose serious power does. It’s not a huge amount of power so it won’t make or break your build if you don’t but you shouldn’t overlook the benefits. Also 02 monitoring is literally only for emissions and has no effect on the engines life or power
Cat should last for a very long time, i dont think that is a major PLUS to do a cat delete lol.
I have seen a catless vs catted race and the difference being almost nothing to talk about from a 40-130.
I also remember back in the day the cats use to limit the amount of boost you can run on stock turbos and to run high you had to be decatted. This platform, you can outrun the turbo psi before the cats become a restriction it seems.
true but track gain is subjective
there’s people with over 1000hp that aren’t doing much better in 1/4 miles due to other limiting factors.
but the increase in turbo spool, throttle response, and power is noticeable to the driver and as mentioned above proven on the dyno but 20-30 whp is probably not gonna translate into a significant difference in track times that’s a given. Also there cars aren’t necessarily made to be 1/4 mile cars
Cat should last for a very long time, i dont think that is a major PLUS to do a cat delete lol.
I have seen a catless vs catted race and the difference being almost nothing to talk about from a 40-130.
I also remember back in the day the cats use to limit the amount of boost you can run on stock turbos and to run high you had to be decatted. This platform, you can outrun the turbo psi before the cats become a restriction it seems.
Cat should last for a very long time, i dont think that is a major PLUS to do a cat delete lol.
I have seen a catless vs catted race and the difference being almost nothing to talk about from a 40-130.
I also remember back in the day the cats use to limit the amount of boost you can run on stock turbos and to run high you had to be decatted. This platform, you can outrun the turbo psi before the cats become a restriction it seems.
Smog/emission components are covered up to 80k miles on these cars because they’re prone to early failure. So must not be super advanced technology. Whether or not to delete cats, that’s up to you but it makes a lot of sense why a lot of people do. I saw someone above say it’s obnoxious lol when it’s really not I’m sure he either A) never heard one with a simple cat delete or B) likes performance cars that are silent
most likely A





