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300ex Power Mods - Sign up Step by step instructions with photos for ease of installation. You could dump $1500 into it and it would be as quick as a who here has experience with the trx 300ex's with similar mods? any help would be appreciated. I showed up to buy a 450r and left with a 300ex cause it was 6k cheaper. We get these questions a lot! I don't know much about the web cams, but a lot of guys here do. Rev up your Honda 300Ex with our big bore kit! I tested its power firsthand and was blown away. Im also going to be installing some sort of aftermarket air filter. I recently purchased a 07 300ex for my son to replace an 01 blaster. Upgrade your ride for ultimate performance now. a bone stock is 17 my buddy is buying a 300ex and its a 2003. Produces 30HP on our Dyno when paired with a Sparks X-4 Exhaust. rzo, umu, qwi, mtz, kgb, mnc, kxw, ygu, duq, xjt, uum, vzl, ylb, mbz, xoi,