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Rausky

01-03-2019 09:41 AM

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?

kumizi

01-03-2019 03:55 PM

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.

dlefty

01-03-2019 05:51 PM

10-25hp is a lot, do it! I am typically seeing around +15hp at the wheels with addition of downpipes.

AMG 17GT

01-03-2019 09:19 PM

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.

dlefty

01-03-2019 10:10 PM

Quote:

Originally Posted by AMG 17GT (Post 7645199)

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.

ronin amg

01-04-2019 11:49 AM

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.

Rausky

01-04-2019 02:01 PM

I guess one good thing about SC is no inspections.

AMG 17GT

01-04-2019 03:24 PM

Quote:

Originally Posted by ronin amg (Post 7645616)

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 don’t find car louder with flap shut, just a little funkier. I assume they don’t ask you to open it up lol.

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