Ive got a Nova GSI with a Courtenay turbo conversion and the exhaust has started to blow and its time for a new one. But courtenay have quoted me £400 for a stainless steel Jetex full system supplied and fitted. Does this sound reasonable??? I was thinking of getting a custom powerflow straight through zorst made with a powerflow downpipe with a motorbike rear can or a 4 inch dp motorsport rear can. Does anyone have any suggestions???