Current BMW:

BMW 8 Series Clear BMW chassis

BMW E31 Exhaust

Supersprint Exhaust Systems

dual muffler system; bolts to the factory exhaust system; dual round tips per side; an excellent sound upgrade with a performance boost to boot!

Applications:
1989-1998 E31 850i, 850ci

Part #: 785006.785026

Price: $2,055.90 (USD)

Catalytic Converters

Catalytic Converter - E31 840i/Ci 1994-1995 - Left (more info)

49 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all states except California. We also offer a version that is legal all 50 states including California. This is for the left Side - Cylinders 5-8, Bank 2.

This item fits the following BMWs:
1994-1995 E31 BMW 840i 840ci

Part #: DEC1468

Price: $439.95 (USD)

Catalytic Converter - E31 840i/Ci 1994-1995 - Right (more info)

49 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all states except California. We also offer a version that is legal all 50 states including California. This is for the Right Side - Cylinders 1-4, Bank 1.

This item fits the following BMWs:
1994-1995 E31 BMW 840i 840ci

Part #: DEC1469

Price: $439.95 (USD)

Catalytic Converter - E31 840i/Ci 1996-1997 - Left (more info)

49 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all states except California. We also offer a version that is legal all 50 states including California. This is for the Left Side - Cylinders 5-8, Bank 2.

This item fits the following BMWs:
1996-1997 E31 BMW 840i 840ci

Part #: DEC1470

Price: $439.95 (USD)

Catalytic Converter - E31 840i/Ci 1996-1997 - Right (more info)

49 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all states except California. We also offer a version that is legal all 50 states including California. This is for the Right Side - Cylinders 1-4, Bank 1.

This item fits the following BMWs:
1996-1997 E31 BMW 840i 840ci

Part #: DEC1471

Price: $439.95 (USD)

Catalytic Converter - E31 840i/Ci 94-95 - 50 State Legal - Left (more info)

50 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all 50 states including California. This is for the left Side - Cylinders 5-8, Bank 2.

This item fits the following BMWs:
1994-1995 E31 BMW 840i 840ci

Part #: DEC81468

Price: $509.95 (USD)

Catalytic Converter - E31 840i/Ci 94-95 - 50 State Legal - Right (more info)

50 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all 50 states including California. This is for the Right Side - Cylinders 1-4, Bank 1.

This item fits the following BMWs:
1994-1995 E31 BMW 840i 840ci

Part #: DEC81469

Price: $509.95 (USD)

Catalytic Converter - E31 840i/Ci 96-97 - 50 State Legal - Left (more info)

50 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all 50 states including California. This is for the Left Side - Cylinders 5-8, Bank 2.

This item fits the following BMWs:
1996-1997 E31 BMW 840i 840ci

Part #: DEC91470

Price: $618.95 (USD)

Catalytic Converter - E31 840i/Ci 96-97 - 50 State Legal - Right (more info)

50 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all 50 states including California. This is for the Right Side - Cylinders 1-4, Bank 1.

This item fits the following BMWs:
1996-1997 E31 BMW 840i 840ci

Part #: DEC91471

Price: $618.95 (USD)

Catalytic Converter - E31 850i/Ci 1990-1994 - Left (more info)

49 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all states except California. We also offer a version that is legal all 50 states including California. This is for the left Side - Cylinders 7-12, Bank 2.

This item fits the following BMWs:
1990-1994 E31 BMW 850i 850ci

Part #: DEC1452

Price: $446.95 (USD)

Catalytic Converter - E31 850i/Ci 1990-1994 - Right (more info)

49 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all states except California. We also offer a version that is legal all 50 states including California. This is for the Right Side - Cylinders 1-6, Bank 1.

This item fits the following BMWs:
1990-1994 E31 BMW 850i 850ci

Part #: DEC1453

Price: $446.95 (USD)

Catalytic Converter - E31 850i/Ci 90-94 - 50 State Legal - Left (more info)

50 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all 50 states including California. This is for the left Side - Cylinders 7-12, Bank 2.

This item fits the following BMWs:
1990-1994 E31 BMW 850i 850ci

Part #: DEC81452

Price: $509.95 (USD)

Catalytic Converter - E31 850i/Ci 90-94 - 50 State Legal - Right (more info)

50 State Legal

This catalytic converter is a direct fit replacement to OEM, but at a third of the cost. No welding required because these bolt on to your stock exhaust manifold and muffler. Backed by a manufacturers warranty - 2 years on the catalyst and 5 years on the external pipes. Legal in all 50 states including California. This is for the Right Side - Cylinders 1-6, Bank 1.

This item fits the following BMWs:
1990-1994 E31 BMW 850i 850ci

Part #: DEC81453

Price: $509.95 (USD)

Oxygen Sensors (O2 Sensors)

Bosch Oxygen Sensor - E30 E36 E34 E32 E31 (more info)

A new oxygen sensor can improve driveability and lengthen engine life. Ultimately, you achieve a smoother running engine that is more fuel efficient. Feedback from the oxygen sensor provides closed-loop control of the injected quantity of fuel for optimum air-fuel mixture, enabling virtually complete combustion to take place. Contaminants in gas and certain atmospheric conditions can drastically shorten the life of any oxygen sensor, therefore they should be checked with every periodic maintenance and changed if necessary. Bosch Part # 13 231.

This item fits the following BMWs:
1988-1991 E30 BMW 325i 325is 325ix 325ic
1992-1995 E36 BMW 318i 318is 318ic 318ti
1992-1995 E36 BMW 325i 325is 325ic M3
1993-1995 E34 BMW 530i
1993-3/1994 E34 BMW 540i
1993-1994 E32 BMW 740i 740il
1988-1994 E32 BMW 750il
1990-1994 E31 BMW 850i 850ci

Part #: 11781735499 (11-78-1-735-499)

Price: $88.40 (USD)

O2 Sensor Bung and Plug (more info)

O2 Sensor Bung and plug. This weld-in bung allows an O2 sensor to be screwed into your exhaust system. It's required for custom exhaust systems, and is also useful for air/fuel ratio measurements when dyno testing. A threaded plug is included to cap off when not in use. Bung and cap/plug are both 100% stainless steel. The bung and plug are also available separately (in case you don't need both). Simply choose your option below.

TMS Oxygen Sensor Bung Specs:

Material 304 stainless steel
1.00" / 25.4mm OD
0.50" / 12.7mm Tall
Thread size and pitch M18x1.5

TMS O2 Sensor Plug & Crush Ring Specs

Material 304 stainless steel
10mm female hex for install and removal
Thread size and pitch M18x1.5
Copper Crush Ring for leak free installation

Install Tips

Locate bung as close to engine a possible, without exceeding the maximum operating temperature for the O2 sensor. The suggested location is just down-stream of the merge-collector on each bank of cylinders.
Sensors located after upstream exhaust system leaks or too close to exhaust outlets are susceptible to poor readings or influence of ambient air
O2 Sensors exposed to exhaust gasses with too high amount of un-burnt fuel can lead to misleading readings. A possible lean reading.
Locate sensor/bung 90° to exhaust gas stream.
Locate sensor/bung in tube with a minimum of 10° up angel to prevent liquid build up in sensor element.
Use stainless steel welding wire or rod when installing bung.
Do not have bung plug or a oxygen sensor installed when welding bung in place.
Welding can distort the bung so it is recommended you chase/tap the threads of the bung after welding.
When installing O2 sensor or plug, use an O2 sensor compatible high temperature resistant grease on the threads.
Use tightening torque suggested by O2 senor manufacturer.

Part #: TEN9949O2S

Price: $18.50 (USD)

Exhaust Hangers and Gaskets

Acousti/Seal Exhaust System Sealing Compound - 5oz Tube (more info)

With years of experience with dealing with exhaust systems of all kinds, we've found this product to be the BEST at fixing or preventing exhaust leaks. Just apply a light coating of Acousti/seal to pipes, flanges or slip-fit clamps before assembly for a leak free installation. 5 ounce tube (142 grams).

Part #: 35959

Price: $19.95 (USD)