I was wanting to find out a few things.
1)I'm installing mac headers with an off-road pipe on a 97. What o2sims do I need, flat or square connectors(I'm thinking square)?
2)what is the part number for the fuel filter and how hard is it to change it?
3)back to the headers, should I use aftermarket bolts? My brother used the supplied bolts and has had no problems.

Thanks for the help!

 

You will need the square connector O2 sims. I think that's the only O2 sim available for GM cars/trucks anyway.

I recommend using stage 8 locking bolts, not only do the locks keep them from backing out, but you can use an allan wrench socket on them (if you have room).

 

Well i don't know the part number for the fuel filter,just get one at the dealer and it is not that hard to change.Also i have MAC headers and i used the bolts and gaskets that came with them and had no problems but i did tighten the bolts about every month or so and when i did my heads i used the stock GM exhaust gasket and have never had to tighten the headers bolts again so i highly recommend the GM exhaust gaskets.