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Old 05-16-2013, 10:31 PM   #1
amanMaphia
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Join Date: Apr 2008
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Location: dayton
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2011 wrx
DGM

Default Downpipe to factory catback fitment compilation...Chime in with your set up.

I have read up and down these forums and can't find a compilation of what downpipes (besides COBB) are a direct great fitment for my 2011 wrx. I am thinking of going catless, and don't see any others that taper down to the 2.5 inch of the midpipe.
Can someone lay this out for me.
People with DownPipes matted to factory catback, I would love your feedback for the 2011 sedan.
Thanks,
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Old 05-16-2013, 10:36 PM   #2
WRX boarder
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go with the grimmspeed gasket and get the dp you want. as a bonus if you decide to upgrade your cbe later you can have a full 3" exhaust with no restrictions
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Old 05-16-2013, 11:00 PM   #3
amanMaphia
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are there no downpipes beside the cobb that taper down to a 2.5 inch? if not then Grimmspeed option would do.

I still would like some further options from those of you that have this set up.
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Old 05-16-2013, 11:41 PM   #4
warpdwhim
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I've got a nameless dp - stock midpipe - grimmspeed adapter in between.
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Old 05-17-2013, 01:17 AM   #5
Uncle Scotty
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Quote:
Originally Posted by WRX boarder View Post
go with the grimmspeed gasket and get the dp you want. as a bonus if you decide to upgrade your cbe later you can have a full 3" exhaust with no restrictions

although it goes against common mans 'common sense'.....

for a stock location, internally gated turbo......using the proper combination of 3" dp and straight through 2 1/2" axle back with a tapered straight through midpipe can actually increase power and throttle response if it is all coated/wrapped all the way back to the end of the midpipe

keep the heat in....keep the gas velosity up as the gas cools and volume decreases...keeps backpressure down

but.....meh... it aint k00 to have less than 3" exhaust

I know what im gonna do for my next exhaust.....and its gonna have a 2 1/2" stromung axleback and the whole exhaust is gonna be coated from the heads to the end of the midpipe

but i dont know nuthin
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Old 05-17-2013, 09:53 PM   #6
p951951951t
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Quote:
keep the heat in....keep the gas velosity up as the gas cools and volume decreases...keeps backpressure down
Uncle Scotty, with utmost respect, you have a lot of knowledge about these cars and good old fashion know-how but sometimes your understanding of physics makes my brain hurt. I would stick to just saying "it works" instead of trying to explain why.
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Old 05-18-2013, 10:49 AM   #7
amanMaphia
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Thanks Scotty. Wrap it up..
I want to know which downpipes have the taper built in to 2.5 inches though and peoples thoughts on them, trying to avoid the grimmspeed adapter.

I am trying to find out my other options besides Cobb for perfect fitment, cuz i'm keeping the catback oem, but want to reflash to the next stage
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