4in. HP40 Slip-On Muffler - Black with Black End Cap. Fits Softail Street Bob, Low Rider S, Low Rider ST & Heritage 2025up P01573814RPARBMP all while out-flowing the competition

all while out-flowing the competition

machined heat treated chrome moly spring seats

* Replaces OEM # 27585-88

* Compression Ratio with SE Extreme 94cc Heads: 132ci is 12

* All steel construction

4in. HP40 Slip-On Muffler - Black with Black End Cap. Fits Softail Street Bob, Low Rider S, Low Rider ST & Heritage 2025up P01573814RPARBMP all while out-flowing the competitionRinehart Racing is proud to introduce the all new HP40 Slipons. Made to the same exacting standards as our HP45 and DBX Touring Slip ons, this free flowing 4" muffler is a perfect fit for your factory 2 into 1 header, and will give you the deep, throaty, Rinehart Rumble you know and love and, with our spiral core baffle technology, the HP40 will also help your bike breathe, increasing the performance for a snappier, more responsive throttle. Tech