106" Big Bore Cylinder Kit for 2007-'17 HD® Big Twins (except '17 touring) - Silver Powder Coat Finish EXHAUST - BAD DAD SOFTAIL 3 1/2" Bore

3 1/2" Bore

Highs are produced by an ultra-efficient 25mm dome tweeter with integrated phase plug and is made water/weather resistant with the addition of a Santoprene front isolation spider connecting between the tweeter housing and cone assembly

Larger 9mm diameter chrome moly tubing provides superior strngth and minizes pushrod flex

HHI now offers these stunning  South Beach HHI / Renegade Custom one-piece billet rear HD Trike wheels

MATCHING BEVELED CONTROL ACCESSORIES:

106" Big Bore Cylinder Kit for 2007-'17 HD® Big Twins (except '17 touring) - Silver Powder Coat Finish EXHAUST - BAD DAD SOFTAIL 3 1/2" BoreThis bolt on big bore cylinder and piston kit will increase the displacement of 96" or 103" engines to 106". It is as easy as a stock top end rebuild and requires no machining or flywheel rebalancing. For best performance, appropriate camshafts, performance air cleaner, performance exhaust and fuel system tuning are required.