There is a BIG difference between the performance of these two popular header designs!

Obviously, this specific example(s) only applies to modern inline-4 motorcycle engines, BUT the header designs still vary DRAMATICALLY between popular triple and twin cylinder engine models as well! To get our custom intake/exhaust-specific ECU mapping flashed into your bike's ECU, head over to 2WDW.com and purchase our Mail In ECU Flashing Service today! If you have any questions, please feel free to email us at support@2wheeldynoworks.com. We are always happy to help.