This billet head suits all KTM ‘GROUP’ 150 2023-on models with the new 150 SX TBI (Throttle body injection) engine. It also suits KTM Group 125SX models from 23-on with the genuine KTM150SX top end fitted. Models include: 2023-on KTM 150 SX/XC TBI 2023-on Husqvarna 150 TC TBI 2023-on GasGas 150 MC TBI Please note – it does not suit the 150 enduro models such as the KTM150EXC or Husky TE150. We have a separate product listing for the enduro 150 TBI bikes. This package includes: A Billet TSP Head (Cap and Insert) Head O-ring & Washer Kit Our key TSP Head features are: Improved throttle performance in the whole RPM range Smoother throttle response Improved combustion chamber design that gives more performance from bottom to top Reduced risk of detonation If you are deciding between our Head/insert or an ERM unit, it is advised that you go for our ERM unit first. The ECU flash will enable larger gains than this head by itself as the standard ignition curves are quite soft. There are gains to be made by just swapping the insert especially with additional smoothness, but this is best complimented with the ECU flash so you get the most out of the head design. Fitting our ECU Flash and Insert/Head at the same time will offer much better performance gains over stock, and the package can be viewed in our ‘Power kits – TBI’ Section. All TSP mods are designed and dyno tested in-house at TSP so you can be sure you’re getting reliable performance for local conditions.