The 12" TDX and Berk HFC combination fit without any issues. The shop had to supply some extra gaskets (for the Berks) since we opted not to use the OEM pieces.
Impressions... no rasp and no fart! The overall setup is noticeably louder, but it is very quiet when cruising and easing the throttle. The exhaust tone has a bit of an exotic sound to it (like a harmony). As others mentioned, I do hear a bit of hiss with the HFCs when the revs dropped.
Car idles fine and no CEL so far. I've not driven it that hard yet, but it feels a bit less constricted and picks up power a bit earlier (by at least 500 RPM) than usual.
Looks-wise, it is very subtle and the stock look is further enhanced by the tips. You'd have to squat low just to see the canisters. So the overall look is not ricey at all (unlike having exhaust canisters point in separate directions).
Whatever it is, this setup gives the VQ37 a much larger and livelier sound. There is definitely a much sportier feel.
to Tony and his crew at Fast Intentions.
for Berk HFC as part of this combo. Together, they fit without any issues.
[EDIT] On another note, you do NOT need to trim the heat shield. Simply bend the edge back towards and around (close) to the rubber fuel hose with the Fast Intentions supplied heat shield. This will double as shielding for these lines as well as make space for the passenger side canister. So NO CUTTING required.