i know i can run flat 15s
i ran a 15.4 with 18s on mine. i have i/e and i had a heavy ass system in it too. weight reduction in the Si is critical... theres simply no torque. whens the next tr.com day at desoto? ill prove that i can run flat 15s with smaller wheels and no system.

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Ballzy2000SI
GrabDBalls@aol.com
Gettin my roll on! Bout to spin da cut in 2nd playa!