Porsche Primary Muffler Bypass Pipe - 911 | 1989-1994 FS-POR-964-PMB 99650436400 A rough running engine or

A rough running engine or poor starting behavior are a common sign of worn seals and components

Introducing the Synthetic Engine Oil 8100 SAE 5W-30 X-CESS (1L)

5mm drain plug while others use a 14 x 1

Oxygen Sensor Location: Pre and Post Converter - Oxygen sensors are located both before and after the converter

Porsche Primary Muffler Bypass Pipe - 911 | 1989-1994 FS-POR-964-PMB 99650436400 A rough running engine orPorsche Primary Muffler Bypass Pipe For Porsche 964 Carrera (1989 1994) Models. Fabspeed Primary Muffler Bypass Pipe This straight through pipe directly replaces the heavy and restrictive factory Porsche OEM primary CENTER muffler with a Porsche Motorsports Carrera CUP style design. This CUP primary muffler bypass pipe significantly enhances sports car sound, noticeably increases horsepower, and reduces weight from an ideal location at the rear of the