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So odd... someone else has a Alpine tune and a Bimmerworld Xpipe with cats in the secondary position and complains of low rpm sluggishness... I'm not sure if that existed before the xpipe install or not Audioslave686
Edit: and now that I think about another friend with a BW catless xpipe and an ESS tune doesn't complain about anything. Could perfectly be coincidence, I'm sure the Alpine tune is just fine.
The Bimmerworld xpipe is a high power design like the ESS one and many others, with an X as forward as possible
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