Engine Valve Spring Seat Camaro LS1 features a flange that

LS1 features a flange that accepts a square-bore carburetors

These Y-pipe assemblies use Flowmaster's exclusive D-port technology and can be used with either the factory rear mufflers or with one of our Axle-back exhaust systems

A rigid aluminum bracket along with quiet vibration isolators allow for versatile and easy installation without having to strap mount to the electric motor like with previous models

The system has a turndown style dump exit right after the muffler to eliminate the over-axle tailpipe

For diesel operation in extremely cold climates

Engine Valve Spring Seat Camaro LS1 features a flange thatthese locators use an inboard locating shoulder to center the seat and hold the spring in place. The 4873 features a 1. 300" OD and a . 520" ID.