Does anyone know if its a good idea to get Titanium piping? im trying to talk my friends dad into making it for me.. will it be nice? i currently bought a 5zigen that fits Si's how can i make it fit my GSR will someone help me out or gimme the dimensions of the piping i should get? BTW it is a 2.5 " collector. i am gonna get a JDM Type R 4-1 header also.