My Greys are flat out with my Universal Turbo's version of the T38, and she produced an honest 430bhp, so if your really after a genuine 450, then I'd go for one of the more modern injectors than a grey.

This was with a 7.5:1 cr, Fully Modified Head, cams Pro Alloy full Intercooler, pre turbo cooler and rad....... the lot !!!!!.....all assembled and mapped by Karl Norris.