No I wouldn't pay for the conversion so made my own as I collected parts, done it quite cheap in the end, all new parts apart from the cat back and its cost me:
JCW air intake (new)delivered £218 from America and to my suprise new set of JCW 380cc injectors were in the box!!!!

JCW cat back £180
Pulley MED engineering £70 delivered
GP I/C £310
Fitted all parts myself apart from injectors and JCW remap and wiring up JCW inatake- dealer did this but due to a mistake they made I ended up getting the money back for the work they did so that was all F.O.C!!
Plugs £32 delivered
Just need a RMW head,1320 cam and jaspeed mani with stock cat fitted
Should be at least 260bhp then
Regards
James