Kooks headers will require a Kooks X-pipe for a bolt on installation to your factory or aftermarket axle back (select in drop downs).
The X-pipes have the following options-
- Off Road - Deletes your catalytic converters.
- High Flow Race Cats - The same catalytic converters the other manufacturer uses. Very high flow, requires a tune to not have check engine lights.
- Ultra High Performance Green Cats - The best catalytic converter you can buy. Rated for 900HP and flows better than standard race cats. In many cases they don't throw check engine lights also.
- All X-pipes are 3" all the way to a 2.5" OEM exit EXCEPT the Z06 X-pipes which are 3" all the way through