Originally posted by wilsel
Depends on what you want. The 4-2-1 creates more power in mid RPM range, the 4-1 creates it's power in the high RPM range. The 4-1 creates more of a power increase overall according to DC's dyno charts. I'd go with a 1 piece.
I have owned both: 4-2-1 one piece on my D15B7 and 4-1 one piece on my B18C1. I realize that the Bseries obviously has more power, but I honestly think that the 4-1 is better. When I ran the 4-2-1 at the track, my high end SUCKED and I know it was because of my exhaust.
I recommend the 4-1.
