We developed and now supply a new box [Pro Active Performance Exhaust] in South Africa for about 450USD [current ZAR/USD exchange is at 1USD/8ZAR. I have used it on my XB12SS with a huge performance advantage.
With a ‘large’ car racing cone filter upgrade costing 60USDand professional ECM Spy programming we saw on the Dyno run a 101 BHP on the rear wheel
The new material used is a neat 105mm Stainless Steel tube at approx 350mm in length with the necessary inserts, both front and rear flanges are bolted onto the tube therefore allowing re-packing, my box have done 12000km with ‘NO’ repacking required
The length of the box allows for the best power before the rev limiter active
The exit pipe are manufactured to the buyers request