I used creative recorder (bundled with my SB Audigy)
You can also use the microsoft version of that, make sure in your recording properties you have it set to 'WAVE" OR "what you hear"
Here is from a crappy HP Digicam mic.....
stock 2.5" pipe from the U-Bend.
Magnaflow High Flow Cat
Stock Resonator
http://www.cal48.com/carsoundcat.mp3
(Right Click, Save As)