I bought some Boss side pipes a while back and need the H Pipe. Any thoughts on where to buy the H Pipe? Also, factory Ford or other?

 

Cant go wrong with factory ford. Search the fourms for a used H-pipe. I have factory quad exhaust and I'm not crazy about the sound they produce wide open or 7/8" discs. I run 5/8" discs just to give alittle sound. From what I understand and read. The Kooks side pipes sound better BUT..they hang lower than factory.
Aftermarket will always have differences.

 

IIRC, the new ones are all gone...so looking for a used one will be your best bet. Worst case scenaio, you could buy a standard H-Pipe and have them welded on by a muffler shop. It should sound the same.

I'm thrilled with mine...it's worth the trouble.

 

Here is a thread that lists the individual part numbers. Since you have the side pipes, you can pick up just the pieces you need.