Quote:
Originally Posted by solstice
The N54 gains about 80 hp with a 20-22psi ( 12 psi above stock ) tune according to this chart:
http://www.e90post.com/forums/showthread.php?t=374508
Not seeing how say 4psi would add the same gains on the S55.
Btw do you know if the S63TU tune requires euro 100 octane to reach 700 hp?
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We only have 91 octane here in Cali, and this M5 with a tune/exhaust is pretty much 700 at the crank.
http://f10.m5post.com/forums/showthr...highlight=dyno