[paulgrey]

I have decided to design my own system, I would like to keep the "stock" apperance i.e. two tips coming out of the rear apron. I thought that the best way to do this would be to come out of the heads and go foward from the motor. Then murge two to one and wrap the exhaust around the engine through in line mufflers and out through the appron. The import thing is to get the right length before the murge... I understand that the length should be determined by the amount of exshust volume in the cylinder e.g. 500cc- the header should be of the right length to take that volume. The only thing I have a question over is the benifit of doing a four to one header over a pair of two to one headers.