Solved.
E92 m3 Comp pkg..for 38k..ess 650kit for 8k used..sport cup 2 tires for $1200...kw club sports for 2500
$49,700 and you have a car that's less than the zl1 and better
But seriously. No stock m3 or m4 (outside of the gts) is going to outperform this car..face it, this battle is lost. And stop using "build quality" as an issue..go get your subframe bolts replaced.
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2017 MB C63 S Coupe - DINAN | MODAL WORKS
retired: GranTurismo MC, Giulia Quadrifoglio, B8.5 RS5, Q60 RedSport, e82 135, F80, e92 M3, e90 M3, (2) e92 335, B8 S4, C209 CLK55 AMG, e46 330