Couple of things, I bought four sticks(26 feet each Of U.S. steel) of cm for about $500, a bender for $650, already had the welder. Imo kits are not the way to go, fits better if you bend it. Use a mild steel rod, i think it is the same as the reg. mig # with an r or s? Used so no preheating and the joint will be less brittle so no after heating. Got this off the web from a big time chassis builder before i started. Look up Miller welding cm. I have 6 bends in my whole chassis, the rest straight and triangulated. One bend went to far, just stuck it in the bumper and bent it back. They use cm for the top classes with maybe three builders so NHRA can keep tom, dick, and harry from putting junk on the track. You will never see cm in a cup car because it would brake not bend like ms. Welding is like a women, it doesn't have to be pretty but you do need good penetration.