Chopper Guys CPI (California Performance Iron) has been one of the leading frame manufacturers for decades and continue to make some of the strongest frames in the aftermarket industry, using TIG welding techniques, and EDT 150 steel.  EDT 150 steel and strategically placed crush points means that in the event of a collision…the frame absorbs most of the impact and not the rider.  Chopper guys don’t just make one of a kind frames…we fabricate to reinvent motorcycle, automotive, and race bike parts and accessories. Please see our Featured Parts on the Menu bar above.