1. Use the original and restrictive manifold and have custom downpipe made leading to generic backbox available from Robin Hood/Great British Sportscars or any other manufacturer.
2. Use an off the shelf manifold such as a Westfield one that goes down and exits through the bodywork in a small hole, again leading to a generic silencer.
3. Use an off the shelf tubular manifold that comes straight out the side of the block, sits on the top rail, and requires the bonnet to be cut to accommodate. Again, followed by a silencer.
4. Learn to weld, order a faceplate and some lengths of tubing, get hold of a motorbike can, and make your own!
I wanted a single exit through the bodywork originally, but ended up with a tubular manifold exiting through the bonnet and leading to a bike can. Apparently this provides the most gain power-wise and is the least restrictive of the options. Think you can get these type manifolds off the shelf for about £150 ish, but they occasionally appear on eBay for slightly less. Bit less of a hit than the expensive £300+ single exit option, but then you have to ask yourself if you want the looks or the performance?!?
