I was thinking about slapping on my stock exhaust starting at the downpipe and back, so for people who read too fast that means everything AFTER the downpipe. I want to put cat and catback on.

My question is do you think that just the downpipe alone will allow enough travel for heat to dissipate during hard driving and spool? Or do you think the backpressure will eventually end up destroying my turbo? I was just going to put the stock exhaust on for meets and then keep the Greddy Ti for track days. Also I do plan on upgrading from an FP black to an HTA 35R .63 housing sometime in the future, would I still have problems with that?

Is anyone currently or has anyone done this before? Thanks for the input

 

bump.

 

I've always wondered what something like an FP Red or FP Black would run like with a full stock exhaust. Just out of curiosity.

 

i ran a built 2.0 with a 35r on pump at 20-22psi and a cutout for 35psi on race gas. Ran decent on the stock cat back and was super quiet except for the wastegate opening. Ran 11.2 at 125mph with that setup.

 

Try it and let us know how it is.

 

cool, thanks. I should be fine then. I want to quiet things down for next years meets.

 

If u could get a HFC in there instead of the stock one I bet that would help a lot. shouldn't make it much louder and the stock cat is a major restriction.

 

no prob.

I did for get to mention I had a test pipe with the stock cat back. Still quiet tho. just a little deeper...

 

Well, what you want to do is get back pressure off of the turbo. As the exhaust gases go down the exhaust piping they cool and pressure goes down. So, it seems to me, that starting out large and going smaller toward the rear of the car should work almost as good as large straight through.

 

I'm running a full 3" dp and tp with the stock catback and it's fine. I think Reese Tuning's running a stock catback on his some 700hp red evo. It sounds sick.

 

^^^Interesting. Are there any vids avail of this so we can hear?

 

bump for more people with 3"dp, tp and stock catback, did you feel power loss coming from aftermarket catback?

 

I have a 3" exhaust up to the stock muffler and have a cutout right before the muffler. The difference when I open that cutout is large. Turbo spools much faster, AFR goes a half point leanet, etc.

 

anyone else run stock-back with test pipe?

 

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