Join Date: Jan 2009
Location: Lawton, Ok
Motorcycle: 96 GSXR750 (parts), ZX7/9RR F-USA AMA SBK, 96 ZX7RR STREET, 96 WSBK ECKL ZX7RR
Re: anyone know whos photobucket page this is?
APOK........ITS NOT FAIR TO COPY AND PASTE MY OWN POSTS, GOOD ANSWER AND RESEARCH HOWEVER,....
The rest of the answer is that it is not relevant if is straight through or not, how big the bore is etc, its not back pressure......there is no real back pressure. What there is, is how effectively you can evacuate a cylinder, and how effectively you can tune the harmonics of the pipe to assist in both this and returning negtive pressure waves during periods of valve overlap (using combinations of collectors,total lengths,lengths to collectors,lengths of silencers,diameters,stepped diameters, etc.).
Now, the midpipe exup type valve is a different discussion entirely.