Well, obviously the MD TDX2, but most systems will be fine. It's the restrictions (i believe) that cause the rasp, so most open systems will be fine.
The ART pipe itself doesn't have rasp, but bear in mind that it's a test pipe, so straight through pipe, but with two huge advantages over normal TP's *and* most HFC's;
1) Doesn't lose low end power and torque like a normal TP/HFC
2) Doesn't rasp like a normal TP/HFC
Make that 3
3) Doesn't increase the volume massively either, does add a nice subtle deep tone.