yea that cobra manifold is an svo, they called it both for some reason?
anyway, 94-95 GT's are not total dogs compared to the 96-98 GT's. a stock foxbody GT or LX5.0 can hand a 96-98gt owner at least a car length or so, depending on drivers. the 94-95 is a little heavier than foxbody so it will lose but not by as much
with stock exhaust, a cobra intake, pulleys, and headers he's probably lookin at 205-210 rwhp on a good day. yes with all your mods to your 6 you've got the drop on him.
many people just think a v8 > v6 ignorantly (it happens to be my opinion, but i know with proper setup and any amount of work, any car can be made respectably fast)
hell, i just got smoked on the freeway by my buddy's 4cyl integra lol. its got a type-r engine/cpu conversion in it, pushing well near 180 to the wheels. and he weighs about half a ton less than i do.
sorry your crap coworker don't know his ass from a hole in the ground, but don't think all gt owners are the same, especially if they're part of this website or others like it
peace