Type: axle-back
Brand: GReddy
Pros: Nice low growl at low RPM/Great howl at high RPM
Cons: Haven't found any yet!
Bought at/Price: On our own classified forum for about $200 (Only a year used)
Comments: It was a very easy install... maybe 1/2 hour, and coupled with my Z tube/Pop Charger, makes nice sound when I mash the skinny pedal.