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Secondary Cat Delete vs Downpipes

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Secondary Cat Delete vs Downpipes

 
Old 01-03-2019, 09:41 AM
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Secondary Cat Delete vs Downpipes

Looking to make the GT S louder, and I've done secondary cat deletes in the past but I'm curious if it's any more beneficial to just do catless downpipes? Would a cat delete be just as loud as catless downpipes? On that same note, do downpipes make a noticeable difference in HP?

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Old 01-03-2019, 03:55 PM
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Downpipes don't see to make much difference in peak hp. Seen anywhere from 10-25. IIRC they make a big difference in mid range tq.
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Old 01-03-2019, 05:51 PM
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10-25hp is a lot, do it! I am typically seeing around +15hp at the wheels with addition of downpipes.
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Old 01-03-2019, 09:19 PM
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This has been kicked around over and over.

IMO if you like spoons in the disposal sound do pipes. If you want more of the same at an octave lower, cut the secondaries.

You will never feel 15 Hp.
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Old 01-03-2019, 10:10 PM
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Originally Posted by AMG 17GT View Post
This has been kicked around over and over.

IMO if you like spoons in the disposal sound do pipes. If you want more of the same at an octave lower, cut the secondaries.

You will never feel 15 Hp.
lots of compliments on the sound, so not sure of the spoons description, but everyone has things they hear differently! So OP, make sure to listen for yourself and decide!
You will NOT feel 15hp, but if you actually track the car, 15hp around a course will shave off a tiny bit of time, and in the 1/4 if you do that should save you a tenth.
is it worth it, that value is different to all, only you know for your situation if it is worth it.

Last edited by dlefty; 01-03-2019 at 10:14 PM.
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Old 01-04-2019, 11:49 AM
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New Ca. Law, modified [louder exhaust] is no longer a fix it ticket. In many cases you will need a trip to the Bureau of Automotive Repair B.A.R. for inspection.
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Old 01-04-2019, 02:01 PM
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I guess one good thing about SC is no inspections.
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Old 01-04-2019, 03:24 PM
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Originally Posted by ronin amg View Post
New Ca. Law, modified [louder exhaust] is no longer a fix it ticket. In many cases you will need a trip to the Bureau of Automotive Repair B.A.R. for inspection.
I donít find car louder with flap shut, just a little funkier. I assume they donít ask you to open it up lol.
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