Wake the Inline Four The stock CB400 exhaust might look okay from a distance, but once you hear it, there’s no mistaking it: tinny, restricted, and far too quiet for a bike that revs to the moon. Swapping the stock system for one of our high-performance slip-ons transforms both the tone and the styling of the bike. With a deeper, throatier note and up to 3hp gain in peak performance, this system helps bring the inline four to life while trimming up to 3.5kg off the rear end. Performance & Sound Our slip-on systems dramatically improve mid-range torque while delivering that crisp, aggressive tone these VTEC-powered motors are known for. Whether you're chasing smoother pull through the revs or just want to be heard in traffic, the results are instant and addictive. Muffler Options The FlankerA modern stainless and carbon-fibre slip-on with removable baffle, giving you the option to tone things down or run it raw. Finished with our mesh grille and carbon end-cap. The MuttOur favourite for the CB400 platform, the Mutt has no baffle, an aggressive tone, and a raw, vintage-racer edge. Constructed with a full carbon fibre shell and 304 stainless internals, it’s featherlight at just 700g, and absolutely howls once VTEC kicks in. Materials & Construction Both systems are built using 304 stainless steel collector pipes, premium welds, and include a spring-mounted connection, clamp, and high tensile 316 stainless mounting hardware. These are built to last, with proper weight savings and durability where it counts. Fitment & Installation Fitment: CB400 VTEC models (NC39 / NC42 platforms) Install time: Under 10 minutes with basic hand tools No tuning or ECU flash required bolt it on and enjoy Each kit includes: Collector pipe Muffler (Flanker or Mutt) Baffle (Flanker only) Springs, clamp, fasteners Spring puller tool Why Choose Us Proven performance gains and aggressive tone Modular muffler options to suit your taste Lightweight construction with premium materials Fast, DIY install no tuning required Built to last with stainless and carbon construction If you’d like help selecting the right muffler for your build or want to chat through custom requests just shoot us an email and we’ll be happy to help.
