Jetex Back Box (3 bolt flange) - Audi 90 (B3) Quattro 20V Type 89 20V 118kW (160hp)/125kW (170hp)

from 1988 to 1991
£471.38 £424.24 inc. VAT



Jetex

Reasons to Buy

  • Made in Sweden
  • EC Approved
  • No quibble lifetime warranty**
  • Original equipment quality
  • Guaranteed fitment
  • Lowest price guarantee
  • UK's number one Jetex dealer

Jetex Exhausts

Lifetime Warranty
Jetex Lowest Price Guarantee

Seen it cheaper elsewhere?
We guarantee to beat any price on Jetex!*

With over 30 years of exhaust design and development experience, Jetex have gained a reputation for producing exhausts that are well engineered, perform consistently and create a perfect harmony between car and exhaust.

Manufactured to TUV standards in Sweden, Jetex exhausts are made to the most precise specifications. Unsurprisingly they specialise in systems for Swedish marques, along with a fantastic range for other European vehicles including BMW and Volkswagen. They also offer a selection of exhaust systems for vehicles manufactured outside of Europe, where a specific demand has been identified.

Jetex is the perfect choice if you are looking for a great quality exhaust system that has been built to last. They offer a performance upgrade on original equipment systems, but they are also a great option if you are simply looking to replace an old or damaged exhaust system on your vehicle.

Jetex exhausts are designed to reduce back pressure and increase torque and engine performance. Each exhaust is specifically crafted for each model to ensure a perfect fit and the right exhaust note.

At Carnoisseur, we have been proudly selling Jetex exhausts for over 30 years. We have fitted Jetex systems to our vehicles over the years, and we wouldn't hesitate to recommend them; they are fantastic quality products that offer excellent value for money.

  • Stainless Steel construction
  • Superb build quality and fit
  • Deep exhaust note, but not too loud
  • Easy fitting
  • Lifetime warranty for stainless steel exhausts
  • Great prices
  • Tailpipes: Twin Round 80mm
  • Fitting Point: Original Pipework
  • Pipe diameter: 70mm
  • EC Approved
45-B91R Diagram

Absorption Designed

Exhaust Absorption Design

Effective sound control is a key element of any high-quality exhaust system. Many factory exhausts rely on internal baffles that restrict exhaust gases to reduce noise - but this restriction also increases back pressure and limits performance.

Jetex exhaust systems use an advanced absorption-based silencer design instead. A perforated central tube allows gases to flow freely, while sound is absorbed by specialist packing material surrounding the core. The result is reduced back pressure, improved exhaust flow and enhanced engine efficiency, helping to unlock increased torque and sharper throttle response.

Jetex systems strike the ideal balance between refined sound and genuine performance gains.


Precision Mandrel-Bent Pipework

Exhaust Mandrel-Bent Pipework

Maintaining smooth, unrestricted gas flow throughout the exhaust is essential for consistent performance. Wherever possible, Jetex exhaust tubing is mandrel bent rather than cut and welded.

Mandrel bending preserves the internal pipe diameter through each curve, preventing the narrowing that can occur with traditional bending methods. This ensures exhaust gases exit the system efficiently, reducing pressure; improving flow characteristics; and optimising engine performance.


High-Quality Stainless Steel Tailpipes

Exhaust Stainless Tailpipe

All Jetex tailpipes are manufactured from polished T304 stainless steel, offering excellent corrosion resistance and a long service life.

Each tailpipe design is carefully selected to suit the vehicle. Most feature a rolled-in edge, creating a clean, understated finish that enhances your car's appearance.


Complete Fitting Kit Included

Every Jetex exhaust system supplied by Carnoisseur includes a vehicle-specific fitting kit to ensure correct installation.

As a minimum, this will include the required exhaust clamps. Depending on the application, kits may also feature stepped adaptors for original pipework, rubber mounting bushes and additional hangers, allowing the system to integrate correctly with factory mounting points.

Tailor made for your car, Jetex Exhaust components need to be fitted in a professional workshop.


* Please note that the following conditions apply to our lowest price guarantee:

  • The product must be in stock
  • It must be exactly the same product with the same specification
  • The price of the item and the carriage charge will be taken into account
  • Excludes traders based outside of the United Kingdom

** The warranty covers defects in materials and workmanship of your Jetex Exhaust, for the lifetime of your vehicle. The warranty does not cover damage due to transportation, storage, improper use, failure to follow the product instructions or to perform any preventative maintenance, modifications, unauthorised repair, normal wear and tear, any type of racing or competition, any off-road use, or external causes such as accidents, abuse, or other actions or events beyond our reasonable control.

Delivery: Estimated between Tue 10th - Wed 11th Feb 2026

Deliveries are made Monday to Friday and exclude weekends and public holidays.

We have an order cut-off time of 1PM on the days that we are open. Our estimated delivery date takes this into account.

If it is available, we will provide tracking information by email.

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Postage & Packaging:

UK Mainland excludes all islands and postcode areas IV, KW, PH, FK17-21, PA21-78

If you are ordering multiple items your total postage charge will be reduced. Please check your basket for the total cost.

  • Rear Silencer
  • Stainless Steel
  • Tailpipes: Twin Round 80mm
  • Fitting point: Original Pipework
  • Pipe diameter: 70mm
  • EC Approved
Carnoisseur Staff

Trading For Over 40 Years

  • Family owned and operated since 1979
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