1978-1988 G-Body LS Exhaust Accessories

Exhaust hardware for finishing a 1978-1988 G-Body LS swap behind the headers: 3 inch to 2-1/2 inch cone reducers, stainless band clamps in 2-1/2 and 3 inch, a 3 inch band clamp for an O2 sensor, and stainless steel header bolts.

Steps 3 inch down to 2-1/2 inch
Stainless clamps in two sizes
Stainless steel header bolts

G-Body headers, mounts and the crossmember are on the 1978-1988 G-Body LS swap page. Manifolds and the full clamp lineup are under LS swap exhaust parts.

G-Body LS exhaust accessories

Reducers and stainless band clamps

O2 sensor clamp and header bolts

Sizes on this G-Body page

Cone reducers: 3 inch inlet to 2-1/2 inch outlet
Stainless band clamp: 2-1/2 inch
Stainless band clamp: 3 inch
O2 sensor band clamp: 3 inch

G-Body header and exhaust notes

Collectors on the BRP G-Body mid-length headers are the ball and socket type, and the O2 bungs are already on them.
The guide names the T-56, 4L60E, 4L65E, 6L80 and 6L90 as the transmissions these headers work with.
G-Body headers are laid out for a floor shift linkage. Plan on modifying a column shift linkage.
Expect to remove the starter, a valve cover or some plugs on certain header installs.
BRP builds its G-Body kits and headers around the GM LH-8 oil pan.

Header notes from the 1978-1988 G-Body LS install guide. Sizes come from the product names.

1978-1988 G-Body LS exhaust FAQ

What do the cone reducers do in a G-Body exhaust?

They step a 3 inch outlet down to 2-1/2 inch pipe. Measure your collector or manifold outlet and your pipe before you order.

Do BRP G-Body mid-length headers need an O2 bung welded in?

No. The G-Body guide says the mid-length headers come with O2 bungs and ball and socket collectors.

Which stainless band clamp fits my G-Body pipe?

Go by pipe diameter. This page has a 2-1/2 inch and a 3 inch stainless band clamp, plus a 3 inch clamp made for an O2 sensor.

Will G-Body headers work with my column shifter?

The guide says the headers are designed around a floor shifter linkage, so a column shift linkage will need modifications.