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On my f90, I've had the following:
First, I installed the race chip on an otherwise stock car. It definitely makes power, but only felt at top end. Car did 10.8 at 128 in florida summer.
Then, I had a eurocharged ecu flash (removed race chip). Car was slower....only did 11.0, at same track, and same fuel, and same weather. Low and mid ranges were improved over race chip, but top end was dead. Throttle closures, etc.
Removed ec flash and went with weistec ecu file. Strong low, mid, and top end. Car did 10.6 at 130 at same track as before. Great drivability too.
Now have stacked jb4 on top of weistec ecu flash. car does 10.2 at 136. We'll do some more tuning on the ecu file in Feb when tuner in town. Car has superb streetability, and is fast. Very happy with this setup. JB4 is a cool tool.
Car also has awe intakes, remus catback, and beta tcu tune (will be revised).
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