
Exhaust - Cat Pipe (JHM) 3" w/ High Flow Cat (HFC) for B7-A4 2.0T


- 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 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.
- 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 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. THE JHM DIFFERENCE:
The JHM B7-A4 2.0T 3" Cat Pipe starts with nearly a 3 and a half inch opening at the turbo outlet! The outlet on the stock K03 turbo is 3.15 inches, so if we were to go with only a 3" inch opening on the pipe, we'd already be choking off the turbo! We opened up our pipe to the OEM Turbo to Cat Pipe gasket size which is actually slightly bigger than the OEM catalytic converter inlet. Click to enlarge picture




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Off-road use ONLY: THIS PRODUCT IS FOR RACING COMPETITION ONLY AND IS NOT LEGAL FOR USE IN HIGHWAY OR STREET VEHICLES OR OTHER NON-RACING COMPETITION OFF-ROAD VEHICLES. BY PURCHASING THIS PRODUCT YOU ACKNOWLEDGE ITS INTENDED USE.
Make | Model | Chassis | Engine |
---|---|---|---|
Audi | A4 | B7 (2005.5-2009) | 2.0t FSI |
- Excellent fit and finish! Great looking HFC, beautiful welds! Installed perfectly, no CEL, hardware kit was an excellent addition. I feel my car has been juiced up with a little extra power, especially in the higher RPM range of 3-5k RPM. Its definitely been "woken up". Turbo lag is basically gone. Yet this is a very stealthy addition, my wife didnt even hear a difference. So to you guys out there that have an exhaust noise limitation imposed by your "better half", this is the pipe for you! Great deeper undertones under WOT, and a very subdued tone during normal driving. (Posted on 1/30/2017)
- I get tons of compliments on the sound of my exhaust people can't believe it's still factory stock with only a test pipe. Love the sound, performance and finish look after installation. The installation kit is great and makes install much nicer. I rant and rave about this test pipe all the time. (Posted on 10/24/2015)
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I just have to say, it's worth every penny! You can actually hear the Turbo spool when you rev it idle or a stop, and it just is a lot more aggressive and gives you a bit of that good old gas smell without being overwhelming. With that and a Revo Tune, while on stock tires without any other mods besides mounts, got a 0-60 of 5.5, compared to 7.2 from C&D.
You definitely owe it to yourself to get this ASAP (Posted on 7/11/2014)
Warning: This product may contain a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.
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