Product Description
The BimmerWorld View - Unlike older car models, BMW equipped the E9X M3 cars with good headers from the factory. It took absolutely every racing trick up our sleeves to gain power, but our new BimmerWorld Longtube headers produce proven results and are guaranteed to surpass expectations. Beyond putting out big power from stock engines (and even more from stroker and supercharged applications), our true equal-length headers change the shape of the exhaust sound, eliminating some of the muddiness of mismatched exhaust pulses for an intoxicating, crisp, and harmonious note.BimmerWorld E9X M3 Longtube Tri-Y Headers:
Aside from forced induction, the exhaust system remains the best place to extract more power out of a modern BMW. Stock rear mufflers flow well, and you can significantly reduce weight and change the tone and volume of your exhaust by bolting on an aftermarket part, but it takes a fully-engineered system to maximize power output. With hard work and years of experience, we can always find power even on modern performance models that come with sophisticated engineering from the factory.
Our BimmerWorld E9X M3 Longtube Tri-Y Headers are the result of several years of design and iterative testing, making everything from minor dimensional adjustments to complete layout changes on order to produce the only truly effective product available:
- Computer Modeling - determining exactly what the specific engine needs, based not only on power output curves, but also piston size, stroke, valve size, cam profiles, etc is just the first step. A header processes the exhaust gasses, and to maximize the efficiency, we have to model the natural exhaust flow and create a system of eight cylinders pulse-timed to work together with the combined result greater than the individual parts. The result of this modeling process is a theoretical set of design parameters that are often good enough to go on even a pro-level racecar, but for us, with the goal of wringing out every last horsepower, this was only the beginning.
- Header Layout -The computer model suggested that the best gains would be achieved using a 4-to-1 design - four equal-length primaries merge into one collector. We built a set and fitted to multiple cars for dyno testing, and we were fairly happy with the result - good high-end horsepower on street cars and racecars, with both stock and stroker engines. We then revisited the Tri-Y design where primaries merge in pairs, then join in a final merge collector with the goal of producing more usable low-end torque. With many dollars and months invested, and the added expense of manufacturing a Tri-Y product, we were hesitant to change our path - but we're glad we did! Beyond its superior performance in the upper RPM range used on track and for racing, the low-end gains make this header system a fantastic overall performance product as well, with big torque where you use it the most.
- In-Car Packaging - Fitting larger equal-length headers is a challenge, especially when fitted within the constraints of a production body and while retaining additional components. To fully optimize the tubing length/volume and layout, we used a coordinate measuring machine (CMM) to create a computer rendering of the engine bay. The result is an exactly equal-length header that fits properly and produces power.
- Testing. Testing. (And More Testing) - After hours of engine and chassis dyno time, multiple sets of test parts, and seemingly endless phone conversations and email exchanges, we can confidently claim to have optimized this header system with little regard to time or expense. Call it obsessive, but the primary motivation of gaining an advantage over our competitors on the race track has resulted in the absolute best product available.
Tri-Y Headers & Racing Mid Pipes - Technical and Production Features
- Tri-Y Design - Cylinders are paired properly to assist in exhaust scavenging to maximize low-end torque and the area under the curve with no loss in high-end horsepower.
- Stepped Primary Tubes - Primaries step from 1-5/8" to 1-3/4". The smaller diameter boosts low-end torque while the step to the larger diameter in the primary frees the exhaust gasses for higher RPM flow.
- Merge Collector - 2" secondary pipes flow into a merge collector with a 2.5" venturi and 3" tailring to promote scavenging.
- Race center pipes are sized correctly for use with headers and then exits to any axle-back muffler system of your choice
- Race center pipes available as straight pipes only (previous racing catalytic section is discontinued)
- Precision Production Fixture - Production fixtures are laser cut and exceedingly robust, with contact points every few inches to ensure the part you receive fits perfectly as designed.
- Laser-Cut Flanges - Flanges are precision cut from thick 3/8" 304 stainless stock to retain shape, with voids for weight reduction.
- Mandrel-Bent Tubing - One-piece tubes are solid-formed instead of pieced together for smoother exhaust gas flow and long-term durability.
- Band-clamp attachment maximizes underbody clearance and makes exhaust removal and installation quick and easy.
- Full 304 Stainless Steel construction for heat retention, durability, and corrosion resistance.
- Full lifetime warranty against defects in materials and craftsmanship.
Notice of Emissions Non-Compliance. Removing, disabling, or altering emissions equipment on a pollution-controlled road vehicle is illegal. Installing devices or software that trick, disable, or modify emissions controls and monitors on a pollution-controlled road vehicle is also illegal. This product is sold only for racing, competition, track, or other off-road use. It's use is prohibited in any motor vehicle that is subject to emissions inspection or control. It is not legal for installation or use in California on any pollution-controlled motor vehicle. Not legal for installation or use on any pollution controlled motor vehicle in any state, province, or jurisdiction governed by, or which has adopted, CARB or EPA regulations.
