2026 Low Rider ST Stage 1 Upgrade

2026 Low Rider ST - Stage 1 Upgrade

This 2026 Low Rider ST received a Stage 1 Upgrade and custom Tune that unlocked an impressive amount of power without even touching the engine. When you hear it running, you’ll swear there’s a performance cam inside (see video below)

We installed an Arlen Ness Oval Air Cleaner Kit which allows a high-flow of clean air into the Milwaukee-Eight Engine so it can breathe properly. Then we fitted an SPC Big Bore Exhaust to help move that air flow through quickly.

We left the engine untouched (for now), purely focussing on improving the air flow with performance parts and a full custom tune. The Dyno results for this simple Stage 1 upgrade are significant (see chart below).

Horsepower increased by 19.45% from 99.71 to 119.10

Torque increased by 13.26% from 112.19 to 127.07

This SPC Big Bore Exhaust & Arlen Ness Oval Air Cleaner combo is a proven Winner, and this 2026 Low Rider ST now sounds as mean as it looks with an aggressive exhaust note that’ll get your adrenaline pumping as soon as you fire it up.

For expert advice on these upgrades, or any other V-Twin performance parts for your build, please call Rollies Speed Shop on 07 3252 5381 or click the button below.

SP Concepts 2-into-1 4.5in. Big Bore Exhaust

* 4.5″ high flow performance rolled cone muffler with stepped baffle from 2 ¼ to 2 ½ inches. Increases bottom to mid-range torque and horsepower on all motors. Tuned properly can accommodate 88″ to 143″.

* 065 stainless steel headers stepped from 1 ¾” to 1 7/8″ to 2″ at the collector

* Hand tig welded from top to bottom

* Machined stainless steel header collars

* 18mm o2 bungs with 12mm adapters, allows for stock or wideband sensors

ROLLIES PART No: SPC-1-003

Arlen Ness Stage 2 Oval Performance Air Cleaner Kit

Fits 2023up Center-Cooled M8 Models with Gen 2 heads & throttle body (Does NOT Fit Road King Models)

* Complete air cleaner kit, includes backing plate & all necessary components for easy installation

* Features a performance filter with a pleated top to take in air from the sides & top of the filter for maximum airflow

* Filter cover, spacers & clamps are all CNC machined from billet aluminum

ROLLIES PART No: AN-600-206

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