Originally Posted by gearheadslife
the factory exhaust manafold is stamped steel header.
at least it is in my fiero
I believe you're talking about the one I'm thinking about- where the center two ports are siamesed after the exhaust flange and the outer two are about a foot length of piping then they all come together in a really crappy merge.
Cut the flange off, fill in the center of the #2 and #3 exhaust section and weld up some pre bent sections. You can find calculators online to spec your required diameter and lengths.
There's also the hedmann option, which isn't a bad one, but its a little more expensive to go that route and won't be perfectly matched to your combo.
On the s10 (with the 2.5l) I had there was plenty of open space to put your header- on a fierro that may be a harder proposition.