Originally Posted by 1cleanZ

I've elected to go with Resonated HFCs (had in my G37 and loved them). For the catback I went with a NONresonated Xpipe and SS canisters.

I've looked into MD, but just wouldn't consider it. Ran nothing but Fast Intentions on my G37, and not looking to change now. Only options for me were Resonated TPs or Resonated HFCs. The "pros & cons" of both, the HFCs came out on top. The midrange of TQ from 3500-5500 is higher in the HFCs, with the HP of the TP not surpassing the HFC until nearly 6k in the powerban.

What people don't realize is how much flow HFCs truly have.