Stock STI piping is 2.5 inches all the way stock WRX is 2.25 all the way. Yea lol I passed a Harley guy at 35 or so percent throttle and was louder and he stared at me. He's used to being the obnoxious guy around! I notice a loss in top end but a tiny bit quicker spool btw. I don't even like top end.. because it's too damn loud. Like 3k-4k rpms I would bet is louder than a Blitz Nur at WOT. I can't believe just how loud it is. At 2k RPM my entire cabin vibrates.
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What's a library, dad?"
"Oh, it's just a place where homeless people come to shave and go BM."
- Chris and Peter Griffin
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