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Exhaust - Downpipe-Y (JHM) 2.75" to 2.5" for B6-B7 S4 Cat-Back on B7-A4 2.0T Auto-Tip



Sale Price $1,424.95

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**NOTE: This Downpipe/Y-Adapter is for quattro automatic-tiptronic transmission B7-A4s.**

As a follow-up to our release of our record setting 3 inch catless test-pipe for the B7-A4 2.0T, we are proud to release our 2.75" to dual 2.5" Downpipe and Y-Adapter for the B7-A4 2.0T. This is the same style downpipe that was featured on our record setting Research and Development JHM B7-A4 2.0T for the fastest stock turbo quarter mile record (13.38 at 100.3 mph):

Our JHM 2.75" to dual 2.5" Downpipe and Y-Adapter allows you to run either an OEM B6-S4 or B7-S4 stock cat-back or an aftermarket cat-back made for a B6-B7 S4 with stock sized downpipes. We also offer an option for this Downpipe that will allow you run a true 2.5" B6-B7 S4 cat-back on your B7-A4 2.0T for the best exhaust flow possible!

We wanted to offer our customers the best performance possible, at the highest quality possible, at the lowest possible price. This led us to design this downpipe and y-adapter for the B7-A4 2.0T so it would mate up to OEM B6-B7 S4 cat-backs. The B6-B7 S4 has a 4.2L 40 valve V8 with 339 horsepower from the factory so the cat-back has the potential to flow enough air for most customers' needs. Since the majority of the B6-B7 S4 owners are upgrading to other cat-backs, OEM B6-B7 S4 cat-backs can be found for relatively cheap.

For those looking to get the absolute maximum power out of their stock turbo B7-A4 2.0T, we recommend running a true 2.5" cat-back. Many cat-backs for the B6-B7 S4 actually neck down to stock pipe sizing so make sure to find a cat-back with true 2.5" connections like our Fast Intentions 2.5" Cat-Back for the B6-B7 S4. Note: While cat-backs made for the B6-S4 will bolt right on to a B7-A4 2.0T, cat-backs made for a B7-S4 will require a B7-S4 rear bumper valence or modification to your bumper.


After the turbo on the B7-A4 2.0T there are 3 different components in the exhaust system:

- TEST PIPE or CAT PIPE (OEM Cat Pipe): This pipe is the shortest section of the exhaust system and can be seen from the top of the car. It attaches to the turbo outlet and in stock form, contains the OEM Catalytic Converter. There are two oxygen sensors located on this pipe - one right after the turbo outlet and one after the cat. After the cat, this pipe bends down to connect to the next part of the exhaust system, the CAT-BACK which includes the DOWNPIPE and the REAR EXHAUST.

- CAT-BACK - DOWNPIPE: This section of the exhaust attaches to the cat pipe and runs down from that connection over the CV shaft then under the passenger side of the transmission cross-member. In the stock formation, it connects to the REAR EXHAUST via a slip fit clamp where the end of the DOWNPIPE slips over the REAR EXHAUST.

- CAT-BACK - REAR EXHAUST: This final piece of the exhaust system is connected to the back of the DOWNPIPE and in the stock configuration splits into two pipes after exiting a resonator. After the resonator, the pipes continue to go apart and then lead into a muffler on each side. At the exit of the muffler, the REAR EXHAUST ends with the tips that you can see at the back of your car. Sometimes this section of the exhaust is mistakenly called the "cat-back". On the B7-A4 2.0T, a true cat-back exhaust would replace BOTH the DOWNPIPE and the REAR EXHAUST sections. Most quality exhaust manufacturers sell true "cat-back" exhausts that will bolt up to your OEM cat-pipe or your test pipe. However, we have found that a number of manufacturers making exhaust products for the B7-A4 2.0T will market a rear exhaust system as a cat-back. Use this information to make sure you know what exhaust components you are replacing.

OPTIONS - Cat-Back Connection: You can order your JHM downpipe/Y-adapter to mate up to an OEM B6-B7 S4 cat-back (along with OEM sized, aftermarket B6-B7 S4 cat-backs designed to mate up to stock pipes) or to mate up to a dual 2.5" cat-back connection like our JHM-FI B6-B7 S4 Cat-backs. Select your connection type from the dropdowns below.

- 1x JHM B7-A4 2.0T Downpipe-Y
- 1x JHM B7-A4 2.0T Downpipe-Y Installation Hardware Kit (3x Allen Bolts - 8mm x 25mm, 3x Narrow Lock Washers, 2x Exhaust Hanger Spacers, 2x Longer Exhaust Hanger Bolts)

Click to enlarge picture
Audi Exhaust - Downpipe-Y 3 to 2.5 for B6-B7 S4

- 2005 to 2008 B7-A4 2.0T with quattro automatic-tiptronic transmissions

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This product fits the following vehicles:
Make Model Chassis Engine
Audi A4 B7 (2005.5-2009) 2.0t FSI
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Vehicle Code § 27156:
(b) No person shall operate or leave standing upon a highway a motor vehicle that is required to be equipped with a motor vehicle pollution control device under Part 5 (commencing with Section 43000) of Division 26 of the Health and Safety Code or any other certified motor vehicle pollution control device required by any other state law or any rule or regulation adopted pursuant to that law, or required to be equipped with a motor vehicle pollution control device pursuant to the National Emission Standards Act (42 U.S.C. Secs. 7521 to 7550, inclusive) and the standards and regulations adopted pursuant to that federal act, unless the motor vehicle is equipped with the required motor vehicle pollution control device that is correctly installed and in operating condition. No person shall disconnect, modify, or alter any such required device.
(c) No person shall install, sell, offer for sale, or advertise any device, apparatus, or mechanism intended for use with, or as a part of, a required motor vehicle pollution control device or system that alters or modifies the original design or performance of the motor vehicle pollution control device or system.

Health and Safety Code § 43000:
43001. The provisions of this part shall not apply to:
(a) Racing vehicles.

As the aforementioned code sections outline, it is against the law to operate or use a vehicle on public streets or highways with modified, altered, or disconnected motor vehicle pollution control devices. This may include but is not limited to, Evaporative Fuel Controls, Catalysts, DPF, PTOX, PCV Systems, Exhaust Gas Recirculation Systems, Oxygen Sensors, Thermostatic Air Cleaners, Air Intake Systems, Fuel Injectors, Regulators, Adjustable Cam Gears, ECU Programming, Mapping, or other Computer Modifications. Air Pumps, Air Injection, Timing, and any other Emission System Modification(s).

Purchaser acknowledges and certifies to JH Motorsports Inc., that Purchasers vehicle will only be used for racing applications or off road vehicle use only. Purchaser requests these modifications for the purpose of enhancing the vehicle for competitive Racing Applications and will not use this vehicle on public streets or highways. Purchaser agrees to indemnify JH Motorsports Inc., all employees, officers, owners, and subsidiaries for any civil or criminal liability arising out of use of Purchasers vehicle on public streets or highways as Purchaser has been duly notified of the laws and regulations regarding disconnecting, alteration, or modification of a vehicle’s pollution control devices. Purchaser understands and has been advised the driving of a vehicle on public streets or highways could result in criminal or civil penalties.

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