Catted vs. Uncatted Downpipe

[65sohc]

I wouldn't say loud but significantly louder than stock. I love how it sounds but wouldn't want it any louder.

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[black_sedan]

Did he happen to say how much more HP and TQ a catted downpipe usually gives over a stock setup?

I never bothered to ask.

 

[Extreme Power House]

10 to 20 more WHP

 

[Shay]

I installed a Function Werk catless DP. The DP had a CEL fowler built in and no CELs in 1500 miles.
Catless is louder but not overly loud. I don't see how you are going to here the turbo better with a louder exhaust.

 

[Lendo]

Until before/after dyno sheets are posted I'm skeptical there is a big difference.

 

[underdonk]

Until before/after dyno sheets are posted I'm skeptical there is a big difference.

I now have an AA catted and an aFe uncatted sitting in my office. AA is going on the car now due to a terrible design flaw in the aFe (which they have since stopped making - let me know if you want me to post pics). Until there are some dyno numbers out there for the different versions from different vendors, I think anything aftermarket in terms of downpipes if going to get you "dem good gainz."

 

[Loco38SUP]

My biggest reason for going catted was to not have that unburned fuel smell at startup. It’s horrible if you startup inside a garage or sitting at stop lights!

-RJM

 

[underdonk]

My biggest reason for going catted was to not have that unburned fuel smell at startup. It’s horrible if you startup inside a garage or sitting at stop lights!

-RJM

It is strong! Funny, though, I actually like the smell. I'll run the AA catted until they break the '21 ECUs then buy a high-quality uncatted downpipe to run and tune out the CEL. I'd run this aFe uncatted I have but they made some mistakes with this thing... and they want me to pay for shipping to return it!

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