I will be running ARTs and the Shockwave very soon, i will also be using the TDX2 HFC option, it replaces the mid pipes on the Shockwave, order directly from Tony @ Motordyne.
A word on the ART pipes, they barely give *any* increase in volume at all, my car is also a DD and when i changed to the ARTs and the XYZ pipe, i got a small change in note, not volume.
Do not worry about going ART pipes
PS, the type of HFC's for the Shockwave and the fact they're across two pipes means you'll only lose maybe 1 to 2 HP
