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Just go for it ,I went the long way and cut open and cleaned out. You need some sheet metal skills as the outer shield is very thin and to look like it's never been operated on takes time.
Best mod when combined with high flow air filters. If I'd need more info just pm me or near buffalo NY hear the car in person
Just go for it ,I went the long way and cut open and cleaned out. You need some sheet metal skills as the outer shield is very thin and to look like it's never been operated on takes time.
Best mod when combined with high flow air filters. If I'd need more info just pm me or near buffalo NY hear the car in person
adds noise to my car without me having to cut the secondary cats. The module was not done for any track purposes only street to ADD noise without any hassles of removing anything.
At the track I don稚 need the module really because at full throttle in Race Mode everything will be wide open already.
When you are noise tested at the track they are wise to exhaust valves and make sure that your system is set to open when they measure. Thus removing cats could possibly mean not being able to run because I知 too loud.
Sorry for the confusion.
Im looking at the EVM too - curious though, is there a straight pipe available to slip into the resonator removal, or does it require cutting the factory exhaust? I havent put my car on a lift yet, but I would rather lean towards something that is also reversible without creating permanent scars. Fabspeed had this kind of thing for my 911 that you could bolt on in place of the first set of mufflers in about an hour. Be nice as an option here too.
I知 not aware of any bolt on kits for the secondary cats
Originally Posted by Skilly
Im looking at the EVM too - curious though, is there a straight pipe available to slip into the resonator removal, or does it require cutting the factory exhaust? I havent put my car on a lift yet, but I would rather lean towards something that is also reversible without creating permanent scars. Fabspeed had this kind of thing for my 911 that you could bolt on in place of the first set of mufflers in about an hour. Be nice as an option here too.
I am almost positive everyone who has removed them has cut them out and welded in a pipe in their place. The market for such a piece just isn稚 big enough for the GT痴 compared to the 911...
I am almost positive everyone who has removed them has cut them out and welded in a pipe in their place. The market for such a piece just isn’t big enough for the GT’s compared to the 911...
My guess is that it's a great consideration for the crackle/pop increase - the remaining unburned fuel that would cause that is getting consumed here. I just hate cutting up exhaust in such a noticeable way. The question in California is would it pass SMOG. Visually, no, but most of the shops just stuff the probe in the tailpipe and test away.
But my understanding is removal of the secondaries has no effect whatsoever on emissions. I知 sure there are members on this thread from CA that can chime in. I do know for a fact that up here in Toronto, removal has zero effect. If your questioning removal try the EVM. I guarantee you will be pleased.
But my understanding is removal of the secondaries has no effect whatsoever on emissions. I’m sure there are members on this thread from CA that can chime in. I do know for a fact that up here in Toronto, removal has zero effect. If your questioning removal try the EVM. I guarantee you will be pleased.
They are really to back up the primary cat during start ups and downstream should particulates make it past generally. There isn't an O2 sensor behind them, so the CEL wont go off with them absent; its more about the visual inspection as well as the sniffer in the tail pipe during testing. Its federally illegal (down here) to remove them so a visual inspection, if done, will be an automatic fail. Leaves me to wonder if anyone is passing CARB testing under the sniffer. Also, would be great to hear a before/after video to see if its worth it beyond the EVM option (which seems far less hassle).
But my understanding is removal of the secondaries has no effect whatsoever on emissions. I知 sure there are members on this thread from CA that can chime in. I do know for a fact that up here in Toronto, removal has zero effect. If your questioning removal try the EVM. I guarantee you will be pleased.
Any chance that you can take a video of your car in Race, so the stock exhaust flap is open and then compare it with the RENNtech module on/off? I havent been able to find anything that lets you hear the effect - their engineers said it was significant because the stock system doesn't fully open the valve. Be nice to get a real world account of the change.
Any chance that you can take a video of your car in Race, so the stock exhaust flap is open and then compare it with the RENNtech module on/off? I havent been able to find anything that lets you hear the effect - their engineers said it was significant because the stock system doesn't fully open the valve. Be nice to get a real world account of the change.
I can do a cold start in the morning with everything open no problem. It痴 going to be a bit louder because the car is parked underground and I back it in...
Any chance that you can take a video of your car in Race, so the stock exhaust flap is open and then compare it with the RENNtech module on/off? I havent been able to find anything that lets you hear the effect - their engineers said it was significant because the stock system doesn't fully open the valve. Be nice to get a real world account of the change.
I have stock exhaust, but every once in a while, I'll get a cold start where the exhaust valves are open further than they've ever been (I'd assume 100%), and it is significantly louder.
Ok. Let’s try this again. The first video is cold start. The other is S+ Just after the cold start after it settles down. Turn the volume up and enjoy.
the video doesn稚 do the sound any justice. The volume is louder and crackles and pops are much crisper and sharp. The juice is worth the squeeze. Get the module. If you can get it from the source even better
Let me know if you end up going direct from the source via Orcblog's suggestion. If so, count me in for one as well. I'll cover half the "process" and split shipping, then I'll pay for you to ship it to me once you receive them.
Someone chime in if I am wrong, there is nothing wrong with being a perfectionist, in my opinion, and I have owned and modified a lot of high end vehicles over the last 35+ years, that mod no matter what you use, pipe, material etc, is not going to make much difference in performance or sound, upgrading down pipes, exhaust system will, but not just the pipe used for removing secondary cats, just make sure that the weld is good but sounds like he is a perfectionist. lastly there is a debate on if the pipe should go over or inside the removed cat ends, and X pipe is another debate that can go on as well.
doing a little more research on this - when MB designed this exhaust with the secondaries right at the bottom of the primary, they decided to make it all one piece.
That means when you cut the secondaries out, you bugger up the complete downpipe. I had been looking for a secondary bypass - I could see that the aftermarket downpipes came in two sections byt couldn't figure out why it was so hard to find just a bypass (I think Weistec sells it but couldn't find others). Just a further consideration if you are planning on cutting out the secondaries - living in CA, or anywhere that requires smog checking (with visual inspection) that could end up being an issue.
2003 CL55 AMG 2019 C300 Coupe 2017 AMG GTS 2020 A 220
I live in CA, have had my car inspected, they do not even check, or would not even know as most cars do not have secondaries, there is no emissions related systems in the secondaries, so it will not show up in any test.
I live in CA, have had my car inspected, they do not even check, or would not even know as most cars do not have secondaries, there is no emissions related systems in the secondaries, so it will not show up in any test.
I dont disagree about their value - no sensors inline past them so they wont affect the CEL - I'm just a little uncomfortable having to rip into what is really the complete downpipe and figure others might want to know. I suppose if you can find a good exhaust specialist, the surgery can be done with minimal scarring.
My Shop used the exact tubing as factory and based on the placement of the curve of the pipe you can稚 tell unless you go in there with a scope LOL. You池e not bugging up anything except standard exhaust pipe.
The 3000 degrees your eliminating will certainly help wear in long term as well.
My Shop used the exact tubing as factory and based on the placement of the curve of the pipe you can’t tell unless you go in there with a scope LOL. You’re not bugging up anything except standard exhaust pipe.
The 3000 degrees your eliminating will certainly help wear in long term as well.
Did you replace the secondaries with a pipe or just emptied the factory secondaries that looks like a pineapple.
if you have a picture of ur car from under i would love to see.
Man. I swear. The zombie thread from hell, only reason I’m responding is I’m still self isolating LOL. Replaced it with standard muffler pipe exactly like what Mercedes uses and I did not clear out cans or do anything fancy it was $175. There is nothing else to be said here you guys it’s all been covered ...............make a decision and live with it and close this damn thread.
After a week of owning my GTS I had the secondary cats removed. $120 bucks. Wayyyyyy better, perfect "loudness" way more pops and crackles. If you are contemplating just do it. Cannot beat it for the price you will be very happy. PLUS in comfort mode the car is as quiet as stock, best of both worlds.
05-30-2020, 08:52 AM
