Hey all, I’m going to upgrade the engine on my kids’ monster moto kart, to the predator 212cc. Taking it to my buddy’s place to extend the frame a few inches to fit the engine more comfortably. My question is what kind of steel tube do I need for the extension pieces? The company’s website says it’s just tubular steel. Welding is new to me, he said to make sure I get the right kind f steel, gauge,tempered, etc... thanks for any help!