Need some help from you guys am looking at single exhaust for 2004 busa choices Akrapovic evoloution - BDE gen 3 - Yoshi tri oval dual outlet any help greatly appreciated . I am only new hear but have got lots of great information from reading posts . Thanks for any help also which exhaust would provide most gains , mods so far small air box mod and BMC filter changed to all small stacks in air box also have pc3r.