my friends 02 M6 ws6 has the follow mods, what should he do next?
(that wouldn't void the warranty)

MTI lid / KN filter
GMS mass airflow sensor
smooth bellows
75mm ported TB
long tubes / cutout
lca's and relocation brackets
sfc's and tunnel brace
panhard bar
drag radials

would 4.10 give a decent gain?
maybe a PRO 5.0 shifter?


help decide what next....

thanks

jesse

 

pro 5.0 shifter. he still has a warrenty after headers?

 

yes the dealership told him it was ok, and they fixed an oil leak after the header install