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Audi A3-VW CC GTI GLI-B6 Passat Downpipe with High Flow Cat 3” 2.0L FPIM-0475

Product Details

Audi A3, VW CC GTI GLI, B6 Passat Downpipe with High Flow Cat 3” 2.0L #FPIM-0475
  • Engineered with an interlocking T-304 liner to ensure maximum flex while the outside is thick braided stainless steel.
  • 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

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…

 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

Download PDF here… FPIM0475 Layout1

Your Billy Boat Exhaust system was designed to be a direct replacement exhaust system, while offering the best performance, finish and value available from a stainless steel exhaust system. Proper installation will ensure a lifetime of quality and performance from this product.   Removal

  1. Disconnect the NEG (-) battery terminal. Disconnecting power from your vehicle may allow the computer to “clear” its memory during installation.

   For the FSI version

  1. With the engine cool, disconnect the MAF sensor near the top passenger side of engine. Remove the wire from the clip holding it to the shroud. Unclip the turbo intake pipe from the engine shroud. Separate the two pieces. (Note: use care not to lose the O-ring gasket).
  2. Unclip the air snorkel from the engine shroud. Move the snorkel clear of the connection to free the engine shroud.
  3. Remove the engine shroud from the engine.
  4. Unplug the upper oxygen sensor and remove the wire from the clip attaching it to the firewall.

For the TSI version:

  1. Disconnect the MAF sensor plug near the top driver side of the engine shroud. Remove the wire from the clip holding it to the flexible air tube.
  2. Unclip the flexible air tube from the solid turbo inlet pipe. Move the tube clear of the connection. Unclip the other end of the flexible air tube from the MAF sensor housing. Remove the tube from the vehicle.
  3. Unplug the upper oxygen sensor and remove the wire from the clip attaching it to the firewall.
  4. Remove the upper downpipe oxygen sensor from the factory. (Note: take care and keep the sensor end of the O2 sensor clean.)
  5. Spray the downpipe flange mounting nuts with a rust penetrating spray. Allow the penetrating spray to soak then remove the two upper flange nuts.
  6. Remove the CV Shaft heat shield from the rear of the engine. Remove the two lower flange nuts.
  7. Remove the lower O2 sensor and tuck it out of the way.
  8. Unbolt the downpipe grommet bracket from the vehicle.
  9. Remove the two tunnel braces.
  10. Remove the downpipe from the vehicle by sliding the mounting flange off the studs from the turbo. Remove the downpipe grommet bracket from the factory downpipe hangers.


  1. Place the gasket onto the studs coming out of the turbo. Slide the flange over the mounting studs. Hand tighten the four nuts. Tighten the two lower flange nuts first and then tighten the two upper flange nuts.
  2. Install the upper O2 sensor and tighten. Reconnect the O2 sensor connector the plug and attach the wire with the retain clip on the firewall.

  For the FSI version:

  1. Install the engine shroud. Align and fasten the turbo intake pipe. Plug in the adjacent MAF sensor plug, and anchor the sensor wire to the engine shroud.
  2. Align the flexible air tube with the MAF sensor housing and install the retaining clip. Align the other end of the air tube to the solid inlet pipe and install the retaining clip.

For the TSI version:

  1. Align the flexible air tube with the MAF sensor housing and install the retain clip. Align the other end of the air tube to the solid turbo inlet pipe and install the retaining clip.
  2. Plug in the MAF sensor plug and attach the wire to the air tube.
  3. Mount the CV shaft heat shield to the rear of the engine. Bolt the downpipe grommet bracket to the vehicle.
  4. Push the provided hanger into the grommet bracket with the center hole aligned with the slotted hole on the downpipe bracket. Install the bolt and nut onto the hanger bracket. Tighten the nut and bolt at this time.
  5. Place a 3” clamp onto the lower downpipe section on the catalytic converter side and slide onto the upper downpipe. Make sure the O2 bung is facing upwards and toward the passenger side of the vehicle. Tighten the clamp snugly.
  6. Install the O2 sensor into the O2 bung. Note:  If connecting to the factory cat-back: trim the rear of the lower downpipe to allow room for the supplied adaptor and clamps. If connecting to an aftermarket 3” cat-back: do not use the supplied adaptor.
  7. Install the two factory tunnel braces.
  8. Insert the two front hangers into the rubber grommets.
  9. When the downpipe is in the desired position, tighten all the clamps starting from the rear to the front of the vehicle. Tighten the nut and bolt at the hanger.
  10. Reconnect the NEG (-) battery terminal. Start the vehicle.
  11. With the vehicle running at idle, check for exhaust leeks at each connection. If there is a leak, check the mounting hardware it tight.
  12. Enjoy this fine product for the life of your vehicle.

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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