Not legal in California and may not be legal in states with emission control laws. This 2-piece unit is a direct replacement for the highly restrictive stock unit that goes from the turbo to the catalytic converter. You MUST have the factory GM headers to install this unit. Everything happens faster. The more exhaust you can remove from the engine, the more power it will make.
Instructions show how to port the turbo housing to further increase flow.
1986-87 headers are known to crack. Replace those cracked headers with this new stainless steel unit. Let's face it. The more exhaust you can remove from the engine, the more power it will make. You need to get air into and out of that motor to make it run to its potential.