Just pick the reducer size that matches the diameter of the header collector. Bolt it to the collector ring, and weld on the tailpipe. If you have a header without the collector ring, use
Hooker slip–on reducers. They're sized to slip over the collector and weld to the exhaust pipe.
Super Competition Reducer, Slip–On, 3" OD Collector to 2 1/8" OD Tailpipe, One Pair
Installation Notes
Sized To Slip Over The Collector And Weld To The Exhaust Pipe
Shipping Dimensions
L
8.250 in. x
W
4.750 in. x
H
4.750 in.
Weight 3.100 lb.