No sheetmetal work on the "A" SB Hooker SC's. Headmans require a tube through the inner fender, IIRC. The Hooker fit stinks in relation to the steering gear (no PS) and ground clearance (under steering gear), but the SC don't cook plug wires like the comp headers do (a mild positive... lol) . That's the trade off you have to live with. Dougs and tti fit better, but a lacking in the HP department. Headmans and Hooker make better HP, but, don't fit as well.