gsxr 4 if i switched oil pans and as would a gsxr 4 pipe fit if you switched oil pans those cross over tubes help the midrange to think that the pipe is longer than it is when the revs are low as the revs gain they hardly do anything and the pipe is back to same lenght you see sorta like a illusion but yes they work good.
cheers
Jay
I was wondering what those crossover pipes were for.
Question: Do you happen to know if the oil pan/sump from a GSX400
F is the same as the GSX-R400
R pan/aump.
Best info I can find says they use the same engine, but the exhaust setup on the photos I've seen looks slightly different.