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Coupon Code Inside.
Modification Level Air Intake: All Stock Air Filter Stock Air Filter Box with improved air filter such as K&N Pods, Cones or Spikes Forced Air
Modification Level Exhaust System All Stock Exhaust system Stock Exhaust resonator removed or Baffles partly removed Aftermarket Exhaust system with baffles Fully open, unbaffled Exhaust system
Modification Level Timing Stock Timing Stock timing plus additional advance of 4 degrees or more