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I am a DIYer who has had several M cars and modified them all. I read and research and shop patiently and carefully. Have had a 99 M3 for almost 20 years that I first supercharged, then turbocharged and later added a built shortblock and then a fully worked head. Had an E90 M3 for 10 year that got a tune, meth injection, intake, underdrive pulley, full exhaust, carbon fiber driveshaft, 6 piston from calipers and larger rotors, Bilsteins and lowering springs, swaybars, wider and lighter wheels, etc. Have an F90 M5 with a tune, meth injection, intake, turbo manifold, full exhaust, springs, etc.
Definitely more and more complex. Good scan tool and some special tools needed.
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