The Pypes SGA12S is a Street Pro crossmember-back exhaust system built specifically for the 1970-1971 Pontiac GTO. It uses 2.5 inch mandrel-bent 409 stainless tubing with an X-pipe crossover and Street Pro mufflers, and ships as a complete kit with 2.5 inch tips. This part is the GTO-specific version of the GM A-Body system.
- Type: Crossmember-back exhaust system
- Series: Street Pro X-Pipe
- Diameter: 2.5 in
- Material: 409 stainless steel, mandrel bent
- Muffler: Street Pro
- Crossover: X-pipe included
- Tips: 2.5 in
- Sold as: Complete kit
- Part number: SGA12S
Vehicle Applications
- 1970 Pontiac GTO
- 1971 Pontiac GTO
FAQ
What does the Pypes SGA12S fit?
It is built specifically for the 1970-1971 Pontiac GTO. The 1968-1972 Oldsmobile 442 uses a different part number, and other GM A-Body cars use the SGA10 series.
What muffler and crossover does it use?
It uses Street Pro mufflers and an X-pipe crossover.
What size are the pipes and tips?
The system is 2.5 inch with 2.5 inch tips.
What is the SGA12S made from?
It is mandrel-bent 409 stainless steel.
Is the SGA12S street legal?
Yes. It is a crossmember-back system for these pre-catalytic cars and does not delete any emissions equipment.

