HP decrease after installing BMW PE?
Hi guys,
I just ordered my bmw performance exhaust for my 325i(2.5ltr 160kw)
its only the back box & not the mid pipe as its an e90 lci, i read online that only installing the back box will give me lesser performance? is that true anyone here with a 320/325/330i installed only the PE back box felt decrease in HP?
Thanks..
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