The zenith of naturally aspirated M engines were still restricted
The S85 and the S65 were the pinnacles of naturally aspirated engine development by BMW M. Yet, like many street engines, it needed to meet emissions target which added restrictions to header design and package.
BMW M engineers still managed to create equal length headers for the S85 and S65, however the V8 benefitted from the experiences learned with the V10 by placing the primary cats on the front pipes, and created a full unobstructed equal length header design.
The V10 has primary cats right after the merge collectors, and are built into the headers.
Compromised solutions to extract power
It's been common knowledge in the M5 V10 communities that performance gains are mostly found by replacing the primary cats, and improving upon the stock header design with a a lengthier runner design.
There has been multiple solutions brought to the market over the years. Rapidly, tuners released primary cat delete pipes that were welded onto the OEM merge collectors. This retained the signature S85 sound, and enhanced performance, yet it wasn't optimal.
Many exhaust manufacturers released long tube headers in various runner and merge collector design. These were the better performing solution, extracting the most power from the V10. Unfortunately it sacrificed the tone of the V10 as it sounded quite harsh.
Power without sacrificing the S85 legendary exhaust note
Infinity Design hit the drawing board and designed the optimal solution for BMW M5 V10 owners: a true equal length, long tube header.
This retained the signature S85 exhaust note, while being the best performing header solution on the market. When paired with tuning, gains of up to 70 wheel horsepower can be achieved over a stock S85 V10.
It truly hit the market and achieved the best of both worlds: performance & sound.
V3 Infinity Design S85 Headers
The design allowed Infinity Design to retain an even diameter across the runners, while achieving the required length through unique curvatures for max performance.
The design went through multiple design improvements as the primary hurdle was packaging. The initial design had slight issues with 02 bungs and and made it time intensive to install.
The most recent design update was implemented to improve the jig's accuracy and precision in order to make installation easier while retaining the signature sound and highest performing header system on the market.
Specifications
- Equal length long tube header design
- Retains F1 style S85 exhaust sound
- 42mm runner diameter for optimal performance on 5.0 displacement and strokers
- Gains of up to +/- 70whp and wtq when paired with tuning
- 304 Stainless Steel Construction
- Bungles for pre-cat, post-cat and temperature sensors.
- TIG welded
- Deletes primary catalytic converters
- Fits LHD and RHD
Installation Notes
Tuning is required to maximize performance gains and remove Check Engine Light (CEL). Professional installation is highly recommended. It requires lowering the front subframe. Slight heat shield modifications are required to clear the runners.
Production Year 2005 can fit the temperature sensors. Head and front pipe gaskets not included. Hardware included to fit the merge collectors to the exhaust runners.
Infinity Design Stage 3 Tuning
If you select this option, you will be contacted by Sal @ Infinity Design to determine the specifications of your tune, including Speed Limited Removal, Vanos tuning, Rev Limiter Increase, Cold Start deletes and other options. Pricing includes the tuning cable.