Allard do a conversion that takes the PD150 up to 245bhp. Costs a whopping 5 grand and you get:- New Turbo, Intercooler, Exhaust, Savage re-map plus some other things. Turned off the attention span after I heard the price................ Derv Doctor does do a dump valve conversion but to be honest, Don't see the point in it as it has no benefits whatsoever apart from the "Whoosh" which is pure boy racer.