There have seen a few posts, on this site and elsewhere about the "fitting" of headers into stock street pinto's. There seems to be some headers on the market that will not fit in a stock pinto without modification somewhere.
I don't have the info on all of the different brands and models, but I am hoping to get some feedback here from other members on their installs.
I CAN talk about the ranger "header", Part # F37E-94280-F, that I just installed in our 78 orange pinto.
*Please note that there is some fabrication/welding needed to install this item*
First, the flange on the collector brings it down to 1.75". That seems to defeat some of the point to the use of it, so I cut off the 'cone' and made it flush with the flange, and this makes it about 2.25". The stock pipe from a 78 will not bolt up to it in it's location anyway, so I made a flange to bolt to it, and got an exhaust gasket to match. To clear all the things near it, the exhaust pipe NEEDS to turn about 20* immediately after the flange like the stock one, but it is back about 8". This is now 'hard' bolted at the flange, so I used a flex tube (joint) just in front of the cat. I ran 2.25" thru the cat and tapered down to 2.0" and out the muffler at 1.75" (full custom exhaust). This was the way that I did it, but there are other ways to do it too.
Installing this item without other modifications made to the engine is a bit of a waste in my opinion. I installed a 'mild' cam and will be doing a carb swap as well as a few other things, and this will supplement them.
My goal with posting this is to keep someone from buying one without knowing what it will take to install it. I see to many ebay items that the sellers state that the parts are a "direct bolt-in" for a pinto when they are not (MII v8 radiators, motor mounts....); Some sellers lie just to sell the item, imagine that. I was fortunate that a friend of mine has a ranger with one of these in it and I was able to get a good look at it (well, as good as you can with it installed) before I got one (unused on ebay). Car-part.com is a good place to try to find one near you as well.
Bill
ADDED: After I posted this, I started the car and realized that there are smog pump or egr holes in the head near the exhaust manifold that are not fully covered by the header. It leaks. I will be working on this and post what I can do about it. I think I will be able to tap the holes and insert set-screws and the flange will keep them from backing out. The stock exhast manifold has a D8 part # so it might not be an issue with the pre 78 cars.