Im looking at buttoning up my e21 M42 exhaust setup. The collector runs 2.25" and I believe the E30 was 2.25" all the way back to the exhaust.
I know quite a few folks go for 2.5" exhaust, but has anyone tried both systems and have concrete feedback?
For me, I want to run a cat, resonator and dynomax super turbo muffler.. just trying to figure out 2.25 or 2.5" piping.
My fear is losing mid-range torque from insufficient backpressure by going to 2.5". Then again, plenty of folks have said that they went to 2.5" without noticing any losses, so who knows.
Regardless Im excited to try the M42 with 2.25 or 2.5 over my M10 1.75".
I know quite a few folks go for 2.5" exhaust, but has anyone tried both systems and have concrete feedback?
For me, I want to run a cat, resonator and dynomax super turbo muffler.. just trying to figure out 2.25 or 2.5" piping.
My fear is losing mid-range torque from insufficient backpressure by going to 2.5". Then again, plenty of folks have said that they went to 2.5" without noticing any losses, so who knows.
Regardless Im excited to try the M42 with 2.25 or 2.5 over my M10 1.75".
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