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Okay, I had an S13 SR. I went from an RS*R ExMag to OEM catback. The car was really laggy and felt like it lost a bunch of power. I never dynoed it on the SR so I don't know how much.
On my V8, going from OEM catback to open exhaust = +60bhp gain! I have dyno sheets to prove it.
Now most aftermarket exhaust won't be as restrictive as the OEM, even if you run 2.5" muffler, but that's a rough estimate for you.
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