Voodoo 4 into 1 Full Exhaust, The Big EZ! Durable stainless steel construction with choice features make the Voodoo Big EZ right for your Hayabusa: Thick 1/4" exhaust flanges, O2 sensor compatible, individual headpipes with spring connected collectors, and Voodoo Muffler. For easy install, new headpipe bolts and install hardware are included with full instructions! Clearance for stock,stretch, wide tire and OSD! ***** You must indicate in the "Surface Options" pull down menu your choice for Voodoo Big EZ pipe finish (stainless or matte black) and Voodoo Muffler Finish (show polish or matte black)****** For 99-12 Hayabusa this is a 4 into 1 full shorty exhaust * Power Commander may be required for proper fuel adjustment * *Speakeasy Baffle not recommended*