Ya I never understood putting a larger diamater wheel in the rear either, other than for looks. Its best to get a light, wide wheel for performance. Obviously even going wider will cause some added weight but you will also increase your traction surface area and it will improve handling a bit more.
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Airaid CAI | Borla S-Type Catback | Amsoil 10w30 and MTG Trans. Fluid
382hp 387ft/lb | 1/4: 12.9 @ 112mph
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