For BMW E36 enthusiasts looking to boost performance, upgrading the exhaust manifold is a common consideration. When exploring options, the choice often comes down to aftermarket performance headers like Turner Motorsport headers versus sticking with OBD2-compliant manifolds. Let’s delve into a comparison to help you decide the best path for your E36.
OBD2 manifolds on the BMW E36 are designed with emissions compliance in mind. These manifolds, typically found on models from 1996 onwards, incorporate catalytic converters closer to the engine to quickly reduce emissions during cold starts. While effective for emissions, this design can be somewhat restrictive and limit exhaust flow, potentially hindering engine performance.
Turner Motorsport headers, on the other hand, are engineered for performance gains. These aftermarket headers are designed to optimize exhaust flow, reducing backpressure and allowing the engine to breathe more freely. This can result in noticeable improvements in horsepower and torque, especially in the mid-range and top-end of the RPM band. Many E36 owners choose Turner headers for their reputation for quality and performance enhancement.
When comparing Turner headers to OBD2 manifolds for an E36, several factors come into play:
- Performance: Turner headers are designed for performance gains, offering improved exhaust flow and potentially increased horsepower and torque. OBD2 manifolds prioritize emissions and can be restrictive.
- Emissions: OBD2 manifolds are designed to be emissions-compliant and include catalytic converters. Turner headers may require modifications to the exhaust system to maintain emissions compliance, such as relocating or upgrading catalytic converters. Depending on your local regulations, this could be a significant consideration.
- OBD2 Compatibility: Both Turner headers and OBD2 manifolds can be made to work with OBD2 systems, but installation and sensor placement may differ. Turner headers might require adjustments to O2 sensor bungs and potentially the secondary air pump system.
- Installation: Installing Turner headers is generally more involved than replacing an OBD2 manifold, potentially requiring more time and expertise.
- Cost: Turner headers are a performance upgrade and typically come at a higher price point than stock OBD2 manifolds.
To understand compatibility, consider these BMW models which share similar cylinder head designs relevant to header fitment:
Same Head, Same Body (Z3 E36):
- 1997 to 1998 Z3 2.8 (Z3 E36) with M52 engine
- 1999 to 2000 Z3 M (Z3 E36) with S52 engine
- 1998 to 2000 Z3 M (Z3 E36) with S52 engine
- 1999 to 2000 Z3 2.8 (Z3 E36) with M52TU engine
Same Head, 3-series Body (3′ E36):
- 1998 to 1999 M3 (3′ E36) with S52 engine
- 1996 to 1999 M3 (3′ E36) with S52 engine
- 1997 to 1998 M3 (3′ E36) with S52 engine
- 1998 to 1999 323i (3′ E36) with M52 engine
- 1996 to 1999 328i (3′ E36) with M52 engine
- 1996 to 1996 328i (3′ E36) with M52 engine
- 1996 to 1998 328i (3′ E36) with M52 engine
- 1995 to 1995 M3 (3′ E36) with S50 engine
- 1994 to 1995 325i (3′ E36) with M50 engine
- 1992 to 1995 325i (3′ E36) with M50 engine
Same Head, 5-series Body (5′ E39, E34):
- 1997 to 1998 528i (5′ E39) with M52 engine (excluding manifold cats)
- 1991 to 1995 525i (5′ E34) with M50 engine
- 1992 to 1995 525i (5′ E34) with M50 engine
- 1999 to 2000 528i (5′ E39) with M52TU engine
In conclusion, the choice between E36 Turner headers and OBD2 manifolds depends on your priorities. If performance is your primary goal and you are willing to address potential emissions and installation complexities, Turner headers are a strong upgrade. If maintaining stock-like emissions and a simpler installation is preferred, OBD2 manifolds are the straightforward option. Consider your specific needs and local regulations when making your decision.
