300 on a mustang is probably close 350 on a dynojet and ~400 horses at the crank. I'd say a pickup of 100 crank horses is pretty decent for a tune and downpipes on an N55. Did you do a baseline? That and the strip will give more details.
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2022 X4 M40i - 2008 135i - 2015 F700GS
On Order - 2024 i4 M50
Scruffy's gonna die the way he lived... Mmhm.
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