How restrictive is the stock exhaust?

TheCanadian

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After my power train warranty expires, I’ve debated just throwing money at my car, but just one issue.

I don’t like a loud exhaust. I think it’s perfect as is for me.
If I did, theoretically, drop in a fuel system and larger turbo + inter cooler + intake, would I significantly harm gains with the stock catback?
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gtman

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Swapping out the exhaust is mostly a sound thing. Minimal power gains at all. You'd be fine.
 
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Gr90

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Swapping out the exhaust is mostly a sound thing. Minimal power gains at all. You'd be fine.
If you are under 400 HP this is true, but if you plan on going bigger turbo you will want to upgrade the exhaust as well. Some users have seen a 30 hp increase when replacing the exhaust when above 400 HP. Best to talk to your tuner.
 

Oddwayne

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Unless you’re going with a “real” big turbo, bigger displacement or cams, than the stock exhaust will be fine and not cause any losses. It’s still a little 1.5. The stock exhaust is sized pretty great for what it is.
 

BoostedDreams

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Unless you’re going with a “real” big turbo, bigger displacement or cams, than the stock exhaust will be fine and not cause any losses. It’s still a little 1.5. The stock exhaust is sized pretty great for what it is.
2.0*. I’ve also heard the samething regarding under 400 stock is good.
 
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TheCanadian

TheCanadian

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I’m okay with losing a bit of power to keep my ears alive. I’m not setting any lap records anyways
 

WOPSiWOT

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Clarify if you mean catback or stock exhaust as in turbo back (stock dp/cat).
 

BoostedDreams

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Clarify if you mean catback or stock exhaust as in turbo back (stock dp/cat).
He did say stock catback in original post. As long as he changes his downpipe he’ll be good. You don’t even need a front pipe sub 400.
 

WOPSiWOT

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He did say stock catback in original post. As long as he changes his downpipe he’ll be good. You don’t even need a front pipe sub 400.
Yeah, I know. I didn’t see DP on his list which is why I asked.
 

SHIFTT_IX_MR

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I've seen over 500whp on a Type R with a FULLY STOCK EXHAUST, downpipe and all - stock. Can't be that restrictive. But im sure you can improve it - somewhat.
 

booost

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You'll notice a lot of the aftermarket is chasing the 1%-5% gains in HP. The majority of the HP comes from more air and fuel no matter how you cut it and idc what anyone says, even getting air isn't that restrictive... You need more fuel. You'd benefit more from an upgraded turbo with fuel system than anything else. Yes I'm sure you can max out the factory MAF but again, chasing the 5% extra hp isn't my personal objective.

In-short, you're not gaining anything besides sound and the potential for some rattles (in my opinion).
 
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TheCanadian

TheCanadian

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Excellent - that sounds like a big plus to me. Only a few more years for that pesky warranty to expire.
 
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