Was it eclipse that mapped it last time Lee ? Who's doing it this time .a lot depends on what boost level you are going to be running at I think . mines around 1.4/75 boost and other cars that have been on rollers norm see over 350bhp up to 365 . mine got mapped on the road off bob rawle 2 month ago so i got no printout . i got the antilag and launch control done as im maffless also running simtek ecu was told its over 350 .but I'm not a fan of RR so it cud be more but I'll never find out . all depends on the mapper and engine and mods etc as each car/ engine is different . I'm no expert but that what I thinks a rough idea . u have a stronger block also . sum lads on here are at around 400 ish . Bish etc . hopefully they will come along and explaine better than me Lol good luck