morgan,
the mods might look/sound cool for a hot-4's subscriber, but in reality are not necessary. the function of a stock
FPR couldnt be simpler, and hence doesnt require over engineering or 200grms of billet cut down to look pritty, its pure function is to maintain a static fuel pressure of 299kpa regulated against manifold pressure.
the stock
FPR operates a 1:1 ratio and is dead accurate when compared to aftermarket adjustable equivelents.
for further info,
http://members.iinet.net.au/~tuna/Tu...Regulators.pdf