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I like you have all 3 cars bone stock, that takes discipline around a place like this
M Coupe is heavily modded, but all on the inside - Shark Injector & performance software, Conforti CAI w/Amsoil dry cone, Billy Boat performance exhaust, H&R springs, Bilstein Sport shocks, Ireland Engineering green subframe busings, UUC TME Red mounts w/Caps, swapped front hats, Whalen shift mashine, Dension Ice>Link, and lots more. Its my weekend racer :-)
5er is pretty much stock except M-tech - but its my wife's car. She's perfectly fine with 545's power and handling as it.
6er is bone stock. Its my daily driver and I spend all my money and time modding M Coupe anyway :-)