I almost bought the Heartthrob, saw one in Las Vegas, and went immeaiately for the BTG Stainless system.
Heartthrob has HUGE grey mild steel resonators(5"+) on each tip, then the 4" crome tip.
I wanted to have some ground clearance. Those huge glass pack resonators looked unfinished and way too big to have on a lowered car.
BTG did some tests on 2.5" systems; apparently you lose some bottom end power without replacing the turbo with a larger one.
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