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2008 M3 updated:
Old: E89X-08-03-540
New: E89X-12-03-502
1.) Throttle response feels more linear and better.
2.) brakes seems to grab better
3.) exhaust on idle sounds deeper
4.) better gas mileage. I expected to be down a quarter plus some of a tank but was shocked to find it about an 1/8 less. I was really shocked because I did lots of city driving and hard launches.
That what I've noticed.
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