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i had perrin TBE on my 04 WRX and i loved it. the downpipe install with ease.. every other week my buddies and i were doing something and taking off the downpipe... think i might go a diff route this time. as i have an 06 Sti and i'm thinking bell mouth..Look into Cobb's DP, it tapers from 3 to 2.5 which increases velocity...Depending how much HP u looking for
 

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sixstarsti said:
Opps. I didn't think Invidia makes dp. But what dp would you guys recommend. sorry bout that...just a newbie.
invidia does make dps, and yeah get the invidia v2 bellmouth
 

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I have the Perrin Catless DP, and couldn't be happier. Fitment is perfect.
 
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