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Exhaust - Cat-Back - JHM B6 S4 Stainless Steel 2.5" w X-Pipe by FI


Product Description



JHM Cat Back Exhausts are MADE TO ORDER products built by Fast Intentions. They should ship in 2 - 4 weeks from the time your order is placed.

These Cat Backs fit Sedans and Avants ONLY The cat backs don't fit the Cabriolets due to the extra structural components under the car to help make up for the missing roof. FI can do them locally in Southern California. However some people have bought the cat back and had either themselves or a local fab shop do some final adjustments (hammering or cutting and welding) to clearance some items. This is not recommended.

Why did JHM decide to sell Fast Intentions Cat Back exhausts instead of making their own? Well after we went 12.97 @ 109.1mph in the quarter mile (fastest all motor time) with a car we tuned with a Fast Intentions cat back we knew the system performed in the real world. We even made some of our own cat backs for local customers to see if we could extract more power. However, we found that no matter what we did we could not outperform the Fast Intentions cat back. So if you can't beat em, join em. So we are now proud to offer Fast Intentions cat back exhausts with X-pipes and optional resonators.

Why 2.5" piping diameter? After much testing and calculations based on the 4.2L 40v V8 engine's demands it is the optimal size. With a 2.25" exhaust you leave yourself no room to grow with more mods. We have also found with a 2.5" cat back torque is not sacrificed and the top end gains and the room for growth far outweigh going with a limiting 2.25" cat back.

Why an X-pipe? Time and time again in just about any car with a Naturally Aspirated V8 there is always more power made with a X-pipe. So why leave any power on the table with a car that doesn't have the luxury of turning up the boost? Bottom line: X-pipes just scavenge better thus creating more power. They also tend to make the car have a cleaner more refined sound. Pic of the X-pipe-->HERE

Click to enlarge picture

Includes: Complete cat back exhaust system with dual 2.5" stainless piping and 2 free flowing Mufflers. Mounting Hardware included.

- Downpipe connection: Select from the dropdown box below if need a 2.5" connection to the downpipes to directly fit our Fast Intentions 2.5" downpipes (should fit other popular 2.5" downpipes with no or minor modifications). Or select the necked down ends to bolt up to OEM style downpipes or piggie pipes with stock pipe diameter.
- Resonators: Select yes or no from the dropdown box below. All resonators are 14 inches long.

- B7-S4 "25quattro" Edition: Select Yes from the dropdown below if you have a B7-S4 "25quattro" Edition S4 with Dual Tips (as opposed to quad tips like other B7-S4s).

Video: B6 S4 with the standard resonated Fast Intentions Cat Back and piggie downpipes. -->HERE

Video: B6 S4 (quarter mile runs) with the standard resonated Fast Intentions Cat Back and Fast Intentions Catless Downpipes (NOTE: catless downpipes are noticeably louder)-->HERE>

Video: B6 S4 (quarter mile runs and burnouts) with the standard resonated Fast Intentions Cat Back and Fast Intentions Catless Downpipes (NOTE: catless downpipes are noticeably louder)< -->HERE>

Chart from quietest to loudest.
1. Standard FI muffler with resonator
2. Standard FI muffler without resonator

For shipping quotes: Please sign in or join then put the items you want in your shopping cart and proceed to checkout.

Note: JHM works hard to make all fitment charts as accurate as possible please read the product description to make sure this is correct for your vehicle.
Make Model Year Range
Audi A4 - B7 2005 - 2009
Audi S4 - B6 2003 - 2005
Audi S4 - B7 2005 - 2009

Find Similar Products by Tag

2.5"  A4  B6  B6S4  B7  B7A4  B7S4  Cat Back  catback  Fast Intentions  FI  JHM  Non Resonated  Resonated  S4  X Pipe  

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