BimmerWorld E46 M3 Race Exhaust

Extract the most power out of your trackday car or racecar with our complete E46 M3 Race Exhaust

The factory uses their common twin-pipe exhaust design on the E46 M3 which is great for packaging - it fits nicely in tight places. But we have been around the block a time or two and built few exhausts for our pro cars, track cars, and project cars along the way and we are good at making things fit. We have also had our fingers in the S54 engine in various environments and we are well-versed in making power. Behold the result - even more impressive than we had hoped when we started building it!

Universal Header Fitment - Direct bolt-on for any standard E46 M3 header, including stock manifolds with converters if you have to run them. Due to our necked-up primary piping, cars using the larger diameter Supersprint V1 Stepped Header can also fit this part by cutting off the short reducer section and welding the included flanges onto the pipes for unrestricted flow.

Race-Quality Merge Collector - Primary pipes flow directly into a hand-built merge collector, specifically designed to increase exhaust scavenging. An oxygen sensor bung is placed after the merge to add a wideband sensor for dyno work or normal monitoring if desired.

Full 3.5" Diameter - It is extremely tight in some areas, but we made it fit, and very close to the body of the car - no low hanging points to drag on your trailer, entrance curbing, etc. V-band clamps connect the exhaust sections for a clean, tight seal with no gasket required. The 3.5" diameter requires hand-piecing mandrel-bent pipe sections together instead of bending longer pipe sections, but we are not willing to sacrifice our goals for ease of production. The final judge is the dyno, and a 3.5" exhaust makes more power than 3" in even a stock engine - and is an absolute requirement for more modified powerplants.

Custom Muffler - We utilized a straight-through custom muffler that fits snugly in the left side of the factory exhaust space without modification. Perforated internal pipe is wrapped with stainless steel wool so the muffler will last. Exhaust flows on a very direct path out of the car, so it isn't quiet and it is not a good choice for your daily driver.

Stock Mounting and Exit Points - We utilize stock mounting points in both the center brace and rear of the car to support the exhaust properly. Stock center mounts are reused and new Powerflex rear mounts and stainless bolt-on hanger are included. Tip is our standard single slash-cut pipe because we feel that a serious part like this exhaust doesn't need to be dressed up with a larger, heavy tip to look like it means business. Single tip exits on the left side.

The Results - Complete header-back system weighs in at 27 pounds (a full 62 pounds lighter than the factory exhaust). Power gain shown on the dyno graph is a full 10Hp and almost 12 ft-lb of torque versus a typical aftermarket exhaust, comparisons to a stock exhaust will yield even more power (enlarge image for dyno graph).

NEW - Optional Resonator - Due to the large number of requests to use this piece in a street environment (or for tracks that have reduced noise limits), all exhausts now include an optional resonator section. This resonator replaces the straight-pipe center portion of our race exhaust with a straight-through muffler with the same construction as the system rear muffler. Utilizes stock rubber center mounts with the included replacement center support bracket and swaps out in approximately 15 minutes due to the V-band clamps used throughout the system.

100% polished 304L stainless steel. Headers not included.

SOUND CLIP - Comparing typical aftermarket street exhaust to race system with and without optional resonator.