Originally Posted by jamie's

to be honest i dont think its making the power claimed just now, a t34.48 will never make 400bhp, the cam will will help it make power a bit earlier and hold the power better,
as already mentioned above, do yourself a favour and avoid pj for any future mapping,
the mapping from there is famous for being bad, i've never seen it myself but just heard from many people i know and trust
if its currently running (supposed)385bhp on a t34.48 at 25psi, then i'd also be asking what type of magic wand he used to map it
i think they've been a little optimistic with the truth there in my honest opinion
you'd need to see a dyno plot with the lambda/AFR on it to see if its rich/lean etc, cant say without
greys should be ok at that kinda power level as long as the rest of the fuel system is up to scratch
so if its mapped right, then no need for it to be leaning out