Find Your Part
- Performance Specs
- Behind the Scenes
- Installation Instructions
Dyno verified gain of ~9 HP and 9 FTLBS TORQUE corrected to the crank.
Like all our power products, these downpipes are dyno developed.
That is an important distinction to be made, as the AWD configuration of the 4.2L V8 S4 precludes most exhaust manufacturers from knowing at all if their products are producing the power claims they are making. AWD dynamometers are still relatively rare, but we have one in house. There are a lot of power claims out there from exhaust manufacturers, but we are one of the very few that can back up our claims 100%.
And not only are our downpipes thoroughly tested and documented, but our construction is second to none. Featuring genuine German HJS metal core catalytic converters, all stainless steel construction, smooth bore flex joints, and proper bracketry, these downpipes will outlast your car.
We know of no other exhaust manufacturer that takes the time to hand finish each and every of their welds internally, where smooth flow is critical. Look closely: you may find that only the clearly visible welds at the inlets or outlets of some systems are ground down smooth, but even the welds you cannot easily see on AWE Tuning systems are finished for flow.
Our exhaust products also feature butt-welded junctions instead of overlapped tubes, and all our flange openings are size matched to their ports.
All these details are very labor intensive, but with AWE Tuning exhaust systems, we promise that you are indeed purchasing the very best.
Below are pictures, dyno sheets, and sound tests of our downpipes. By adding our downpipes, peak gains were ~9 crank hp and ~9 crank torque on our test B6 S4 already equipped with our cat back exhaust, and a gain of ~12 crank hp at 6700 was realized. This means a very tangible seat-of-the-pants improvement that only gets better the higher you rev.
Coupled with our Cat Back Exhaust System, you have increased your power by 7% just through a bolt on modification. Add the G.I.A.C. Flashloader Chip, and you're over a 10% gain and at almost 380 crank horsepower!
Please note that our downpipes are legal only for racing vehicles which may never be used upon a highway.
4.2L V8 S4 Exhaust Dyno Testing
Below are comparision dyno tests as performed on our Mustang MD-500-SE AWD dyno.
All tests were performed on the same car (04 B6 S4 6 speed), with controlled ambient conditions. Each test is the best of 3 runs performed.
Stock downpipes with AWE Tuning Cat Back Exhaust vs AWE Tuning Downpipes with AWE Tuning Cat Back Exhaust
(Above) Installing AWE Tuning downpipes on our B6 S4 test car results in a broad power gain. Gains at the power peaks were 7 wheel hp and 7 wheel torque. Using a 1.28 correction factor, this results in gains of ~9 crank hp and 9 crank tq. The car tested already had our cat back exhaust installed.
Stock downpipes with AWE Tuning Cat Back Exhaust vs AWE Tuning Downpipes with AWE Tuning Cat Back Exhaust, Graphed Differences
(Above) Graph of measured differences between baseline and test in dyno sheet of Stock downpipes vs AWE Tuning downpipes. The AWE Tuning Downpipes produced a maximum increase of 9 wheel hp at 6750 rpms and 8 wheel torque at 4000 rpms vs. the stock downpipes. Using a 1.28 correction factor, this results in gains of ~11.5 crank hp and 10.2 crank tq, with a broad increase of power across the powerband. The car tested already had our cat back exhaust installed.
Stock downpipes with stock exhaust vs AWE Tuning Downpipes with AWE Tuning Cat Back Exhaust
(Above)Here is our complete cat back/downpipe system vs the bone stock exhaust. Gains are broad and very significant across the powerband. This combo produces peak gains of 18.1 wheel hp and 18.6 wheel tq. Using a 1.28 correction factor, this results in a massive gain of 23.2 crank hp and 23.8 crank tq. A gain you can truly feel!
Stock downpipes with stock exhaust vs AWE Tuning Downpipes with AWE Tuning Cat Back Exhaust, Graphed Differences
(Above) Graph of measured differences between baseline and test in dyno sheet of our complete cat back/downpipe system vs the bone stock exhaust. Huge improvements throughout the powerband!
Stock downpipes with stock exhaust vs Stock downpipes with AWE Tuning Cat Back Exhaust
(Above) Here is our cat back exhaust system vs the stock exhaust system. Thanks to 2.25" tubing, free flowing mufflers, and a H-pipe balancer, there are great gains produced. This system produces peak gains of 11.1 wheel hp and 11.6 wheel tq. Using a 1.28 correction factor, this results in an impressive gain of 14.2 crank hp and 14.9 crank tq.