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I dunno... I run dual 2.5 from the headers to, into an H pipe, into 2 12inch glass packs out to my Borla XR's. So its completely wide open from the header back. When I bought the exhaust parts 2 years ago I wanted the loud muscle tone, but its only going to be trouble.
I want to go for subtle and inconspicuous now. I found out the OE mufflers on the STi are 2.25 inlet so no dice there. 350/370z use a single, no good, I gotta keep my eyes open.
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