downpipe question

[mikeydotkom6]

i have a few questions i ve got a 2003 wrx and im looking into a down pipe and i was wondering if the flange on the oppisite side of the turbo would bolt onto to a stock cat back2.5 in does any one know?

[mosc]

I can't understand what you're asking. Please use better English.

[mikeydotkom6]

will a aftermarket down pipe bolt onto a stock cat back even though the pipes are different are the flanges the same?

[mosc]

most aftermarket downpipes use a flat flange and the stock cat back is a donut flange. A simple adapter usually does the job. SOME downpipes use the stock donut flange, but not many.

[man show]

Cobb's bellmouth downpipe (either catted or catless) is designed to mate up perfectly with your stock 2.5" cat back using the factory donut-style gasket OR any other aftermarket cat back with a 3" 2-bolt flange using a flat 3" 2-bolt gasket. The design is very well thought out.

[mikeydotkom6]

do most downpipes have the same size 2 bolt flange and i have been looking for a used or cheaper ap but im having a hard time finding one i put my up pipe on that was kind of a pain in the a$$ got a cai for 25$ from my ### friend now i just need a down pipe and a ap thanks for the info

[newtothegame]

Have you read about the CAIs? Just a thought before parts are put on the car.

[man show]

Yep, in general, downpipes have a flat 2-bolt flange and are designed to use a flat 2-bolt gasket.

[seanwrxwagon]

If you are used to tuning other types of cars a CAI is probably your first thought. On subarus there is a lot of problems with these. Just dropping a quality filter into the stock air box will be safer and do as much for your ride as an intake could do without tuning.
As far as the AP goes, Acura of Temecula accepted a best offer on ebay for $565 shipped for a new accesport V2. This is the best deal I've heard of for a new unit.

[mikeydotkom6]

whats wrong with a cai does it make it run lean or something

[Boostbuddy]

Megan, Cobb, and Agency Power Dowpipes will bolt on to the stock exhaust system...almost all aftermarket DP's will have the two bolt pattern you are talking about..I wouldn't buy a CAI at this moment (especially because your turbo is stock) because the stock inlet system can handle up to 300whp cars with just a drop in filter. Just take out the snorkel and you will be good to go

-Nick

[mikeydotkom6]

rite on i was thinking about taking it off any ways thanks for the advise thinking about getting a megan racing downpipe and my wife wants me to wait on the ap my 21st birthday is coming up thanks fellas

[newtothegame]

Here you go, this might help: BOV and CAI discussions - read before you ask about one

[seanwrxwagon]

Make sure you do your research on the downpipes. For example the Cobb units are pieces of art but they taper to 2.5 inches so that they can mate up with the stock cat back using a doughnut gasket. If you are trying to keep the stock cat back this is great, but for me this POTENTIAL constriction lead me to get an Invidia V4 catted DP. I'm not familiar with Megan's unit.

[newtothegame]

That 2.5 taper over 3" IS NOT that big a deal unless you are looking for the last little bit of HP out of the car. CobbTuning.com - Exhaust Design just a little reading about design, size, catted and non-catted.