[Antipathy]

I'm guessing the exhaust you bought just had the valve removed or permanently opened. It sounded louder, but was really just a stock exhaust.

So you got scammed out of a lot of money, and since shit rolls downhill, E90 winds up experiencing it as well. I'm sure there's some sort of official term for a scam following itself to more than one person, unintentionally.

This would explain why both sides were defending themselves vehemently, but neither side seemed suspicious, at least to me.

No idea what to do in this situation, but I think it only seems fair to refund E90 his money, he shouldn't have to pay for you being scammed. Though it would be nice, but a far fetch, the original person who sold you the fake PE should chime in too in this thread.