I’m debating deleting my Secondary Cats...
05-27-2020, 10:53 PM
#51
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.
stock “cat-back” exhaust on this car flows plenty for big power so no need to change that.
05-27-2020, 11:58 PM
#52
Member
You missed the point, he is doing this for sound not flow. The reason we delete the cats, is because it's a cheap mod to get a better tone that's all, I was just stating if you are gonna spend more money, do it for better exhaust or down pipes and not on a replacement pipe.
05-28-2020, 07:44 AM
#54
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Thread Starter
As the OP on this thread
I decided not to cut mine but instead went with a valve module instead. I am happy I went this way because I do track my car and with increasing noise restrictions I’m able to have my cake and eat it too. Too many cars I know of (not necessarily AMG) have not been allowed to run on track because of noise violations. The module is I think at this time the ability to not only have your cake, but eat it too.
05-28-2020, 08:20 AM
#55
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Removing secondaries just reveals the original engine sound much like taking out the particulate filter. Some days my GT is downright quiet. In addition, those cans will reach 1500 degrees each, which obviously has downsides.
05-28-2020, 08:48 AM
#56
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You’re right
there is a ton of heat there too... I forgot about that but so far so good
05-28-2020, 10:27 AM
#57
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2020 McLaren 720s Spider
I decided not to cut mine but instead went with a valve module instead. I am happy I went this way because I do track my car and with increasing noise restrictions I’m able to have my cake and eat it too. Too many cars I know of (not necessarily AMG) have not been allowed to run on track because of noise violations. The module is I think at this time the ability to not only have your cake, but eat it too.
05-28-2020, 10:52 AM
#59
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I went with the no name...
FWIW, the module installed in under 5 min and works like a charm.
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Skilly (05-28-2020)
05-28-2020, 01:54 PM
#60
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version of the Renntech module. I was able to get it shipped from the UK to Canada. I would say if you can get it then do it. It’s worth it 100%. That being said if I wasn’t tracking my car I would probably have removed the secondaries by now...
FWIW, the module installed in under 5 min and works like a charm.
FWIW, the module installed in under 5 min and works like a charm.
05-28-2020, 02:31 PM
#61
Just cut the cats!
05-28-2020, 02:39 PM
#62
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05-28-2020, 05:46 PM
#65
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I decided not to cut mine but instead went with a valve module instead. I am happy I went this way because I do track my car and with increasing noise restrictions I’m able to have my cake and eat it too. Too many cars I know of (not necessarily AMG) have not been allowed to run on track because of noise violations. The module is I think at this time the ability to not only have your cake, but eat it too.
A lot of you are overthinking this, if you don’t like the mod just reinstall the secondaries.
Last edited by AMG 17GT; 05-28-2020 at 05:48 PM.
05-28-2020, 05:50 PM
#66
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Thread Starter
It makes perfect sense
If you are really tracking the car, choosing a flap module over a pure exhaust mod that increases flow makes no sense. If as you say it opens 100% and is louder Then how would that help on the track.
A lot of you are overthinking this, if you don’t like the mod just reinstall the secondaries.
A lot of you are overthinking this, if you don’t like the mod just reinstall the secondaries.
2. Noise regulations at the track are becoming more commonplace and I think losing $5-700 on a track day because it won’t pass because I’ve removed my secondary cats vs pushing a button and going back to stock mode is valuable. Besides up here the cost is the same.
3. It wasn’t done for the track. It was done purely for noise and fun. My car is plenty fast already.
I will post up some videos later
05-28-2020, 06:30 PM
#68
Super Member
Lol so much controversy on the forum recently.
I think he's saying with the cat delete the car might not pass noise restrictions on the track.
But you're right. The EVM has nothing to do with cat delete. WOT at the track, the car wont be any louder with the EVM. It will sound the same. The benefit of the EVM is you can make the car louder at idle or part throttle cruising around town.
I think he's saying with the cat delete the car might not pass noise restrictions on the track.
But you're right. The EVM has nothing to do with cat delete. WOT at the track, the car wont be any louder with the EVM. It will sound the same. The benefit of the EVM is you can make the car louder at idle or part throttle cruising around town.
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AMG 17GT (05-28-2020)
05-28-2020, 07:05 PM
#70
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Thread Starter
Actually it’s not flawed...
As mentioned earlier the cost is exactly the same here so that is not an issue that needs to be justified
Lastly at no time did I suggest one is better than the other. I merely said the choice I made satisfied me.
05-28-2020, 07:09 PM
#71
Super Member
I'm confused how you think the EVM will make your car quieter.
Last edited by kumizi; 05-28-2020 at 07:13 PM.
05-28-2020, 07:16 PM
#72
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The EVM
At the track I don’t 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’m too loud.
Sorry for the confusion.
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kumizi (05-28-2020)
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05-28-2020, 07:47 PM
#74
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Skilly (05-28-2020)
05-29-2020, 09:52 PM
#75
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.
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Orcbolg (05-30-2020)
