Those look great. I know there is power lost with these but these are no doubt a good improvement over the regular SBO manifolds. I was impressed by how nice they were cast. What do the outlets measure? I would appreciate a verification on that. I have slowly failing ceramic coated Sanderson shorties, which all headers do on the 88, 10+ years old. I might say screw 20 hp, still be able to run my stock starter and have a ton of ground clearance. Did you buy down pipes? The Ram Air Restorations down are true 2.5" down pipes unlike the Pypes which are 2.25" into 2.5", mandrel bent and look really nice. The only plus of Pypes is 409 stainless, if they fit, there has been issues vs aluminum coated for the RAR pipes.