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BMW E39 M5 Cat Back Exhaust System (Round Tips) #FBMW-1100


Product Details

BMW E39 M5 Cat Back Exhaust System (Round Tips) #FBMW-1100
  • 3″ Quad ROUND Double-Wall.
  • Mandrel bent from the highest-grade T-304 stainless steel.
  • Designed, tested, and manufactured to the finest hand-made integrity found in any exhaust system.
  • Limited Lifetime Warranty
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Lifetime Warranty

Have more questions? Contact us!

The Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty or deny coverage under the warranty simply because you used an aftermarket part. READ MORE…

product image WARNING: This product in the physical form it is sold does not present a hazard. However, operations including, but not limited to welding, brazing, or thermal cutting can expose you to chemicals including Chromium, Nickel, Cobalt, Arsenic, Cadmium and Lead which are known to the State Of California to cause cancer, birth defects and other reproductive harm. For more information go to www.P65Warnings.ca.gov
YouTube video
RPM Stock Horsepower BBE Horsepower Gains
1200 48 51 +3
1800 87 97 +10
2400 135 138 +3
3000 168 169 +1
3600 205 205 0
4200 237 241 +4
4800 268 277 +9
5400 290 300 +10
RPM Stock Torque BBE Torque Gains
1200 213 220 +7
1800 253 275 +22
2400 301 +5
3000 295 295 0
3600 299 299 0
4200 297 301 +4
4800 293 303 +10
5400 282 292 +10

Download PDF here… FBMW1100


Installation of the Billy Boat Exhaust on your E39 M5 (FBMW-1100) requires that the original equipment muffler system be cut off, as there is no natural break. It is recommended that a professional do the installation. These installation instructions will guide one through the original equipment removal and BBE installation procedure.


  1. Disconnect the battery negative terminal for safety to allow the computer to reset.
  2. The original muffler pipes need to be cut through to remove the mufflers. Measuring 2.25” back from the front of the differential sump, mark each pipe and cut straight through (see figure 1). Remove all burrs and clean surface of remaining pipes.FBMW-1100-install-1
  3. There are three hangers per muffler on the M5. It is easiest to unbolt the hangers from the vehicle, rather than the muffler, and remove as an assembly. The hangers also support heat shields, which will drop out with the assembly. HINT: The mufflers weight 30-pounds each – watch your head!
  4. With the muffler assemblies removed, remove the hangers and heat shields from them, then install on the car as original. HINT: When installing the hangers, install with the bolts that support the muffler. Once the hangers are installed there is little room to get the muffler bolts in/out of the hangers.
  5. Slip the BBE muffler inlet pipe and supplied clamp over the remaining original pipe. Do not tighten the clamps yet.
  6. Position the muffler in the hanger mounts and thread the muffler bolts (the ones you put up with the hangers) into the BBE muffler mounts. Center and level the exhaust tips and tighten all hardware, starting with the hangers and finishing with the clamp.
  7. Ensure that the mufflers are positioned correctly and do not make contact with heat sensitive objects (CV boots, bodywork, hoses, etc.).
  8. Start the car and drive around the block. Check that the mufflers and tips are still centered when hot. It may be necessary to readjust at operating temperature.
  9. Enjoy your Billy Boat Exhaust!

Billy Boat Exhaust Safety, Installation and Liability Statements

SAFETY: Appropriate disassembly, assembly methods and procedures are essential to ensure the personal safety of the individual performing the kit installation. Improper installation due to the failure to correctly follow these instructions could cause personal injury or death. Read each step of the installation manual carefully before starting the installation.

  • Always wear safety glasses for eye protection.
  • Place the ignition switch in the OFF position.
  • Always apply the parking brake when working on the vehicle.
  • Block the front and rear tire surfaces to prevent unexpected vehicle movement.
  • Operate the engine only in well-ventilated areas to avoid exposure to carbon monoxide.
  • Do not smoke or use flammable items near or around the fuel system.
  • Use chemicals and cleaners only in well-ventilated areas.
  • Batteries can produce explosive hydrogen gas which can cause personal injury. Do not allow flames, sparks or flammable sources to come near the battery.
  • Keep hands and any other objects away from the radiator fan blades.
  • Keep yourself and your clothing away from moving parts when the engine is running.
  • Do not wear loose clothing or jewelry that can be caught in rotating or moving parts.

VEHICLE SUPPORT WARNING: Should the purchaser decide to install this exhaust product at home, be warned that car or light duty truck/van “bumper” jacks are intended for emergency use only. The use of frame contact jack stands in conjunction with a floor jack as main support is highly recommended to minimize accidental dropping of a vehicle while the installation proceeds. We recommend the use of a shop hoist if possible. Please use caution!

GENERAL STATEMENT OF LIABILITY: While we provide information for do-it-yourself installation of exhaust systems and related items, these operations are not without risk. Injury may occur during an installation or exhaust systems and their components may be damaged in the process. We are not responsible or liable for damages that may be sustained to persons or property during an installation. For this reason, we recommend professional installation as the best option when at all possible. While care has been taken in the preparation of the information contained in this web site, Billy Boat Exhaust and BillyBoatExhaust.com does not and cannot guarantee its accuracy. Anyone accessing this information does so at their own risk. It will be assumed that access indemnifies Billy Boat Exhaust and BillyBoatExhaust.com from any and all injury or damage arising from such use.

LOCAL LAWS & LIMITATION OF LIABILITY/DISCLAIMERS: Local Laws & Limitation of Liability/Disclaimers: The regulation of emissions production, noise levels and safety standards is undertaken by the federal government, each of the fifty state legislatures, and by many local municipalities, towns and counties. The manufacturer makes no warranties of merchantability, of fitness for a particular purpose, or that its products are approved for general use, or that its products comply with laws, regulations or ordinances in the states where they may be sold to the ultimate purchaser, the consumer. The entire risk as to the conformity of this product in any such state and as to repair, should the product prove to be defective or non-conforming, is on the retail purchaser, the buyer, the ultimate consumer of such product and it is not upon the seller, distributor, or manufacturer. In this connection, retail purchaser, the buyer, the ultimate consumer assumes the burden of the entire cost of any and all necessary service, alterations, and or repair. The foregoing statement limits the liability of the manufacturer.

If you have any questions please feel free to give us a call. Our direct line to the sales departments is 1-888-228-7435, ext 18. We are in Phoenix, AZ and can be reached 8am-5pm. Should you have questions that images would help explain, please email Mike at mike@bbexhaust.com.

*Please note, we do not follow daylight savings time if you are contacting us outside of Arizona.

We try to put as much information as possible within our product pages to help with application choice and the installation process. The business you purchased our product from can be a wealth of information, but should you need additional help and information, please feel free to call or our sales department.

Monday-Friday 8:30am-5:00pm Arizona time.
888-228-7435 x18 or 623-581-7600 x18

*Note that Arizona does not follow Daylight Savings Time.

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