IDK why but if you were to buy one you can only use one tuner....their HD tuner. Cant be dyno tuned because of software limitations and ABS. You can only run one exh. HD Exh. Its a narrow formula and a motor you need to pray stays together after spending 10-13 grand to install. There is nothing freedom about it.To make it authentic you’ll need to be wearing H-D gloves and put your hand on Screaming Eagle parts books to pledge your allegiance.
Can (does) H-D run their 131 motor, in part, because they offer that as an accessory? Does Polaris offer a factory big bore kit for the Challenger? Of just intake, exhaust and maybe cams?