Good pc. for polishing to improve flow and performance. Paypal only Buyer pays shipping in the US only (48) $175.00 reasonable offers considered. Consider this, polished and smoothed will make LESS turbulence in the air stream allowing for more cylinder filling. Early reports showed 12% flow gain, but further testing is still needed. Great mod that won't hurt performance. Remember the engine is just an air pump& More in+More out = More power.