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Discussion Starter · #1 ·
I have an 09 WRX with the SPT catback exhaust. I think its 2.5 diameter at the midpipe.

I want to get an exhuast cutout because i want it louder. Its going on the midpipe past the 02 sensors. Is backpressure and issue at this point? Do I need a tune since its past the sensors? Im sick of reading that half the people say yea backprssure or tune.
Im looking at these, http://www.protuninglab.com/exco-25...ooglepepla&utm_medium=adwords&id=140894047258

Because they are cheap and im getting one for my friend and his frs because he helped me fix the popping clutch issue.
 
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