This KC Jetfire turbo works great on stock injectors, but to fully take advantage of all the extra air flow you can run up to 175/30 or 190/30 injector. This is a great turbo for those looking to push the limits of their truck. This turbo is made for those who are looking for more top end power but still want to have the ability to tow max weight. This turbo will tow max weight with ease as long as you watch your temps and keep your rpms up. This turbo has a very loud whistle.