488bhp... let's wait and see what figures Jez comes up with, I really doubt that figure for some reason, sounds very inflated for what the Stillen is capable off, but I've mentioned that before to Dom.
We sold a few Motordyne systems in here, can get you the ART pipes. The Motordyne ART pipes are a bit more expensive than the Berk HFC for example and way more expensive than test pipes.
We prefer/supply SPL parts, you can try Clark Motorsport or Cougar Store for Whiteline.
http://www.350z-uk.com/topic/94574-torqen-370z-full-spl-range-best-suspension-upgrade-parts
Adrian