| Heard back from Billet on the performance diference between cast and billet wheels: "The billet wheels do have a larger vein area over cast versions so you can expect approximately 10% depending on your engine setup" Not sure what 10% refers to though...is it 10% more power, more flow, or... FWIW, Garrett claims a 10% improvement in flow with the GTX-R series billet wheels
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