if i remember correct. they have magneti marelli parts in them. magneti marelli makes oe grade caliber parts. so it is very high quality stuff. im actually gonna ditch my billet pos which sticks for a edlebrock 90mm.
im on my 2nd tb now. the previos one the blade rubbed the tb. i had to take a cartridge roll to it to clearance and this other one it ****** hangs open sometimes. its done to me a few times. i put a stock 78mm on my intake and am driving around with that. not one single issue.
besides it being smaller than the 90s