Skunk2 Header Back Complete Exhaust System 12-15 Si
This package is a COMPLETE exhaust system from the header back using:
*Skunk2 Alpha Header (Downpipe)
*Skunk2 Megapower RR Catback Exhaust
Gains can be seen even without a tune. With a tune you can easily see 20hp from these parts. This is the best combo for power gains on the market.