Heavy breathing

S&S have once again turned their performance-focused minds to Harley’s Milwaukee-Eight engine, producing a new intake manifold. The part is larger than standard and flow ported to get more air in. It’s cast from aluminium, instead of polymer, for improved heat tolerance. The result is a claimed boost of 3-5bhp depending on your set up. Available now to fit most M8 models since 2017 for £170.