hey guys,just got a set of headers off ebay that was on a 95 mustang.do i have to put gaskets on or can i leave them off like on the factory manifolds?im going to try and attach a pic of them and see if you guys think that they are factory or aftermarket cause i seen a set off a 99 stang and the looked like junk(real restrictive)compared to these.the mod to the drivers side header will be easy.im not going to grind on the flange or dent the heck out of it.just going to cut a v section out of it and weld it back together to pull it closer to block and away from the steering shaft.let me know,thanks