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      02-25-2010, 02:43 PM   #2
H Bomb
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Drives: 08 M3
Join Date: Jul 2007
Location: FL to NY

Posts: 1,679
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i would say depends. if it is a custom tune just for your car then the tuner is gonna want to dyno it, or a good tuner anyway

if it is universal software for that X pipe then no you don't have to.

alot of people like to see what there gains are and have the car dyno bf and after though

for instance i have the Dinan Midpipe (x pipe) and Dinan Rear Muffler with there matching software and i didn't need to dyno my car. they did that already in the R&D process and so the software tune is universal for the car
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Street- 08 E92 M3- Sparkling Graphite/ Fox Red/6sp
Track- 10 CRF 250-PR2 Race Motor/Ohlins TTX Susp
Hauler- 06 Ford Skyjacker F250 4WD
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