That being said, yes it will fit in both the GT and Manta with no mods. The only issue is the collector flange that needs to be welded onto your exhaust. I found none at any exhaust shop and finally made my own. I wasn't sure what mine was but it looks like a sprint with the bigger flange. Now I know it is a 2.0 or 2.2. I got it from OGTS for what I think was a good price, 125. They may have the flanges, you would have to call. Pretty odd way to find out what I installed already. Seems to work well and flow pretty good. Oh and you will need the different exhaust collector gasket, OGTS has them.