Quote:
Originally Posted by JimD
I'm not trying to be critical of people who like their "performance exhaust" from BMW but it doesn't seem to me that it's a good deal versus the Magnaflow which is a cat back. Larger pipe with smoother bends + a more open muffler seems like it would provide more benefit than just a more open muffler. I'd like a little more sound but I'd like a little less backpressure too and it seems like the BMW offering is really just more sound.
Jim
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You need a good backpressure for the 128 since it has a NA valvetronic motor. In 08 the N52 was made almost as a predecessor for the EfficientDynamics platform currently used based on the use of valvetronic bp.
Sources: work in Bimmer service dept., and speaking in detail on this subject with other techs.
