Stainless steel catalyzer / intermediate muffler by-pass pipe 911 (75-89)

Our stainless steel by-pass pipe for the catalyzer or intermediate exhaust muffler is suitable for the following vehicles:

Porsche 911 2.7 L (1975-1977)              

Porsche 911 S 2.7 L (1974-1977)

Porsche 911 S Carrera 2.7 L (1975) (USA-CAN)  

Porsche 911 S Carrera 2.7 L (1975) (Version for California)

Porsche 911 Carrera 3.0 L (1976-1977)   

Porsche 911 SC 3.0 L (1978-1983)

Porsche 911 SC 3.0 L Sportomatic (1978-1980)

Porsche 911 Carrera 3.2 L (1984-1989)

Porsche 911 Carrera 3.2 L Turbo-Look (1984)

Porsche 911 Carrera 3.2 L Speedster (1989)

This intermediate stainless steel Sport exhaust tube replaces the stock intermediate exhaust muffler (reference 911.010478) or the catalytic converter, for vehicles that are so equipped. It optimizes the outflow of exhaust gases from the engine and reduces back pressure. This has the net effect of increasing available engine power.

This Sport by-pass tube is also fitted with a mounting nut for your Porsche’s oxygen (Lambda) probe.

This Sport by-pass tube is recommended for track use.            

Quantity required per vehicle: 1

Note: This Sport by-pass tube cannot be mounted on 911 Turbo’s. This item is sold separately.

For the installation of your steel by-pass pipe for the catalyzer or intermediate exhaust muffler you will need the following parts:

911.010483: Exhaust muffler gasket, 911 (75-89)

911.010485: Heat exchanger gasket to catalytic converter / crossover pipe, 911/911 Turbo (75-89) + 964 Turbo + 993

911.010486: Gasket, crossover pipe to intermediate exhaust/catalyzer/wastegate pipe, 911 (75-89) + 911 Turbo (75-94)

911.010472A: M8 locknut, 911/911 Turbo (75-89) (9)

911.010472A1: Exhaust bolt, M8 x 40 mm., 911 (75-98) + 911 Turbo (75-94) (9)