Supercharge your 40 valve Audi 4.2 with Tweetler Performance's boost-controlled supercharger kit! Before making any selections, please read below!

Tuning is not included in this price. Turn-key files will be developed amongst many different tuners for your convenience. Ask for more information when when you’re ready to purchase.  

• For the B6/7 S4 and Allroad, this Kit Requires you Buy a Group 25 Optima Red Top Battery. You can find it here: https://www.summitracing.com/parts/ult-9025-160

• The kit will fit any 40V 4.2 timing chain or timing belt VAG engine however has not been tested in every car. It is the customers responsibility to select the correct kit for their vehicle. There are other untested cars which we will work on getting fitment testing done, please email us if your 40V 4.2 Timing Chain Audi isn't listed here.

Leadtimes are currently approximately 24 weeks from order 

Audi S4 B6/7 and Audi C5 Allroad

DIY(Non-Intercooled)

The Do-It-Yourself Kit is for the enthusiast who either is a shop, or has a shop. This is just the basics, the Tweetler designed products and you can source/order your own parts.

Audi S4 B6/7 and Audi C5 Allroad

DIY Intercooled

The Do-It-Yourself Kit is for the enthusiast who either is a shop, or "has a shop". This is just the basics, the Tweetler designed products and you can source/order your own parts.

The DIY Intercooled has everything included as the DIY Non-Intercooled kit with the following additions or changes:

Please make sure to order this on your own! https://www.summitracing.com/parts/ult-9025-160

Audi S4 B6/7 and Audi C5 Allroad

Base Kit (Non-Intercooled)

This kit is intended for the stock block B6/7 S4. The fueling and water/methanol can support up to 525hp on E85.

• Tweetler Oil Filter relocation kit (Sits in the secondary fire wall and requires a smaller than factory battery.)
• Please make sure to order this on your own! https://www.summitracing.com/parts/ult-9025-160

• Tweetler return-less fueling kit Including: 
• Tweetler 6an Fuel Rails.
• Pre-assembled 6an Fuel Lines with Fittings.
• 535lph Fuel pump with Fuel Pump Assembly Accessories.
• Tweetler Dual Fuel Pump Basket and 90 deg pump adaptor.
• Tweetler Hi-Pressure Fuel Filter.
• 630cc wide-angle fuel injectors.
• Tweetler Water/Ethanol Injection kit with 625cc injector.
• Comes complete with wiring harness (automotive relay).
• Kit triggered at 4psi via a provided hobs switch. 
• Tweetler Designed Manifold Items.
• Cast TVS1900 Inlet.
• Cast TVS1900 upper manifold for timing chain engine.
• Cast common lower manifold for 4.2 V8.
• Plates to cover intercooler ports.
• Tweetler Performance Pulley System.
• Tweetler center idler pulley.
• Tweetler 80mm supercharger pulley.
• Tweetler tensioner with pulley.
• Tweetler supercharger tensioner bracket.
• Serpentine belt for supercharger.
• Intake manifold gaskets.
• Gaskets, Seals and Hardware.
• Seals for upper and lower manifold.
• Factory intake manifold gaskets.
• Bolts for supercharger, inlet and covers.

Disclaimer this kit will come running 4psi, Stock B6/7 S4s cannot run above 7psi at any time. Please be in contact with your tuner for where to adjust boost to.

Audi S4 B6/7 and Audi C5 Allroad

It's Intercooled

 With 3x the cooling, instant boost (boost controlled) and the logs to prove it, "It's Intercooled" is a competitive offering with far more capacity than anything on the market. This kit's fueling and cooling is capable of achieving up to 625hp on E85. This kit is intended for Stage 1 or better built engines.

• Please make sure to order this on your own! https://www.summitracing.com/parts/ult-9025-160

The It's Intercooled kit has everything included as the Base Kit (Non-Intercooled) with the following additions or changes:

• Removal of water methanol kit.
• 2x 6" 513cfm fans to mount to factory auxiliary heat exchangers.
• Tweetler drop-in intercooler w/hardware.
• Hosing and Clamps for Intercooler and repurposing factory side mount heat exchangers.
• ZZP 10 GPM water pump.
• Tweetler B6/7 water tank (located where the battery was located).
• 95mm MAF housing with HPX MAF.
• Rising-rate fuel pressure regulator.

Disclaimer this kit will come running boost controlled at 4psi.

Audi S4 B6/7 and Audi C5 Allroad

Street Master

This kit is intended to be a roll racing king. The kit is boost controlled. The "Street Master" is a perfect addition to your stage 1 or 1+engine build! This kit's fueling and cooling is capable of achieving up to 725hp on E85. This kit is intended for Stage 1 or better built engines.

The Street Master Kit has everything included as the It's Intercooled with the following additions or changes:

• Kenne Bell Boost-A-Pump.
• Large front mount heat exchanger.
• Max Flow supercharger water pump with wiring harness.
• Tweetler 90MM Throttle body.
• Power steering cooling kit (front mounted).
• 5 bar Fuel pressure regulator.

 Disclaimer this kit will come running boost controlled at 4psi.

B6/7 S4 and C5 Allroad

Track Super Star

This kit is our top of the line offering of cooling and fueling. The kit is boost controlled, intercooled and comes with our water methanol kit. The "Track Super Star" is a perfect addition to your stage 2 engine build! This kit's fueling and cooling is capable of achieving up to 875hp on E85.

The Track Super Star has everything included as the It's Intercooled with the following additions or changes:

• Addition of water methanol kit including a wiring harness and 1200cc nozzle.
• Tweetler 105mm Throttle Body.
• 970cc@3bar injectors
• Tweetler 64mm supercharger pulley.

Disclaimer this kit will come running boost controlled at 4psi.

C5/D2 (Timing Belt) Kit

DIY Intercooled

The Do-It-Yourself Kit is for the enthusiast who either is a shop, or "has a shop". This is just the basics, the Tweetler designed products and you can source/order your own parts.

The DIY Kit includes:

• Tweetler Manual Boost Controller with hosing and routing instructions.
• Harrop TVS1900 Supercharger
• Tweetler 4.2 Timing Belt Pulley Kit
• Tweetler 6 rib 57mm supercharger pulley.
• Gates 6 rib HD serpentine belt for supercharger.
• Tweetler Designed Manifold Items.
• Cast TVS1900 Inlet.
• Cast TVS1900 upper manifold for timing belt engine.
• Cast common lower manifold for 4.2 V8.
• Tweetler drop-in intercooler w/hardware.
• Gaskets, Seals and Hardware.
• Seals for upper and lower manifold.
• Factory intake manifold gaskets.
• Bolts for supercharger, inlet and covers.

Disclaimer this kit will come running boost controlled at 4psi.

C5/D2 (Timing Belt) Kit

Base Kit (Non-Intercooled)

This kit is intended for the stock block B6/7 S4. The fueling and water/methanol can support up to 525hp on E85.

• Harrop TVS1900 Supercharger
• Tweetler return fueling kit Including: 
• Tweetler 6an Fuel Rails.
• Pre-assembled 6an Fuel Lines with Fittings.
• Rising-rate fuel pressure regulator.
• 535lph Fuel pump with Fuel Pump Assembly Accessories.
• Tweetler Dual Fuel Pump Basket and 90 deg pump adaptor.
• 630cc wide-angle fuel injectors.
• Tweetler Water/Ethanol Injection kit with 625cc injector.
• Comes complete with wiring harness (automotive relay).
• Kit triggered at 4psi via a provided hobs switch. 
• Tweetler Designed Manifold Items.
• Cast TVS1900 Inlet.
• Cast TVS1900 upper manifold for timing chain engine.
• Cast common lower manifold for 4.2 V8.
• Plates to cover intercooler ports.
• Tweetler Performance Pulley System.
• Tweetler center idler pulley.
• Tweetler 57mm supercharger pulley..
• Serpentine belt for supercharger.
• Intake manifold gaskets.
• Gaskets, Seals and Hardware.
• Seals for upper and lower manifold.
• Factory intake manifold gaskets.
• Bolts for supercharger, inlet and covers.

Disclaimer this kit will come running boost controlled at 4psi.

Audi C5 and Audi D2 (Timing Belt) Kit

• Harrop TVS1900 Supercharger
• Tweetler Manual Boost Controller with hosing and routing instructions.
• Tweetler return fueling kit Including: 
• Water methanol kit removed.
• 95mm MAF housing with HPX MAF.
• Tweetler Designed Manifold Items.
• Cast TVS1900 Inlet.
• Cast TVS1900 upper manifold for timing belt engine.
• Cast common lower manifold for 4.2 V8.
• Tweetler drop-in intercooler w/hardware.
• Gaskets, Seals and Hardware.
• Seals for upper and lower manifold.
• Factory intake manifold gaskets.
• Bolts for supercharger, inlet and covers.
• Cooling
• It's Intercooled front mount heat exchanger.
• ZZP 10GPM water pump.
• Hoses, Clamps for intercooler system.
• Swirl style coolant expansion tank. (Customer will decide their best location as it changes from car to car and whether its European or US).

 Disclaimer this kit will come running boost controlled at 4psi.

Audi C5 and Audi D2 (Timing Belt) Kit

Street Master

This kit is intended to be a roll racing king. The kit is boost controlled and intercooled. The "Street Master" is a perfect addition to your stage 1 or 1+engine build! This kit's fueling and cooling is capable of achieving up to 725hp on E85.

• Upgraded front mount heat Exchanger.
• Kenne Bell Boost-A-Pump.
• Tweetler 40gpm water pump with harness (for cooling).
• Tweetler 90mm TB.
• 5 bar fuel pressure regulator.

Disclaimer this kit will come running boost controlled at 4psi.

Audi C5 and Audi D2 (Timing Belt) Kit

Track Super Star

This kit is our top of the line offering of cooling and fueling. The kit is boost controlled, intercooled and comes with our water methanol kit. The "Track Super Star" is a perfect addition to your stage 2 engine build! This kit's fueling and cooling is capable of achieving up to 850hp on E85.

The Track Super Star has everything included as the "It's Intercooled" with the following additions or changes:

• Addition of water methanol kit including a wiring harness and 1200cc nozzle.
• Tweetler 105mm throttle body and inlet.
• New crankshaft pulley for max supercharger speed.
• HD serpentine belt.
• 970cc@3bar injectors

Disclaimer this kit will come running boost controlled at 4psi.