Documenting THE 2008 Audi RS4
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  • Home
  • Performance History
  • General Info
    • Audi Approved Oils
    • Fluid Capacities
    • Maintenance Schedule
    • Manuals & Other Info
    • Production Numbers
    • Vin Decoder
  • Engine & Drivertrain
    • 034 Motorsport Transmission Mount
    • AMD 3" Catback Exhaust
    • AMD 3" Downpipes
    • AMD Clutch
    • AMD Supercharger
    • Engine Compression
    • HSJ Hi-Flow Cats
    • K&N Air Filter
    • Oil & Oil consumption
  • Events & Outings
  • Exterior
    • Fog Light Upgrades
    • Front Plate Delete
    • Laser Interceptor >
      • Overview
      • Rear Sensors
      • Interior Install
      • Front Sensors
    • LED City Lights
    • LED DRL's
    • LED Tail Lights
  • Interior
    • Dome Light Rattle Fix
    • P3cars Vent Gauge
    • Stereo Upgrade
    • V1 & VoodooTec Display
    • Ziza Interior LED's
  • Miscellaneous
    • P310B: Fuel Sensor Gone Bad
    • Gas Mileage
    • VAG-COM Changes
    • Wish List
  • Photos and Videos
  • Wheels, Brakes & Suspension
    • Current Setup
    • PSI Racelines Ohlin TTX36
    • Rotor Repair (Attempted)
  • Contact Me
  • Mods & Maintenance List​

AMD 3" Catback Exhaust   // 10.22.2013

Finally went for the whole catback. I'd been hesitating since the start, as I wanted to stay fairly low key. After hearing Dave's monster for a few months, I just couldn't resist anymore as I had been wanting to hear a bit more from the car. So....I did a 180 and ended up with one of the loudest exhausts out there, and IMO one of the best, unique sounding on an RS4.
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3" front to back with X
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Donny hard at work
AMD did testing on a 2.5" version prior to me coming there, testing power (and sound) of an X-pipe vs H-pipe, vs running straight back. Although it was anticipated that H-pipe would provide best power, it turned out that X won in both power and sound. Mufflers? Magnaflow.

Here's a quick vid of it at start up with a few short revs.
After having it on for a few weeks, I had some fun and did a pull from 2nd through 3rd. Recorded on phone with no external mic, I cracked the back windows a bit to let some of the sound in. The end part of the tunnel is a blast, but the sound in the video doesn't quite do it justice ;) I might try an external mic to see if I can capture it.
I logged the run, too, starting at 2,000 rpm in 2nd and going through 3rd. Looks pretty normal.
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External mic recording // 01.02.2014

Finally, I got an external mic and put it on the bumper to see what it sounds like from the outside. Had some traction issues in 2nd, but you get a sense of what it sounds like cruising and under throttle. Personally - I'm in love with the sound. I think it's vicious in all the right ways, and mirrors its performance well.

Final exhaust tips installed //

Finally got the exhaust tips installed. AMD sourced these and as they didn't have just the finish I wanted, sent them away for ceramic coating prior to installing. They're the same width as stock, but about 1/2 longer in height (4.25" vs 3.75"), which actually makes a pretty big difference visually in terms of filling out that rear valence. I'm very happy with 'em.
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Below pics aren't greatest at showing true height due to angle of tips, but measurements given are accurate.
Stock: 3.75"
Custom: 4.25"
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Freshly back from getting ceramic coated
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Not the best angle for comparison, but you get the gist. Custom fills out valence much better.
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Update: HSJ Hi-Flow Cats installed  //05.11.2015

Read all about it.
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