ok I bought a used RB road race header & custom dual mid pipes which I plan on connecting to a 82' dual 2 to 1 style muffler in rear. What size bolts do I need for the header flange to mid pipe and mid pipe to muffler flange? I'd like to know so I can be ready with the proper hardeware when the header/mid pipe arrives so I can do the install myself. Thanx

 

I'm gonna say M10. Use a high grade, or stainless steel bolt so they dont get messed up. Your going to need atleast 12. I think the header used 8 or 6 to connect, so get extra.

 

Why don't you take your header into the hardware store with you so you can find out exactly the thread size and length you need? I do it all the time... I took my rear SA bumper in with me once.. people really gave me looks LOL.

 

hell man go nuts, walk into the store with the part find the nut borrow some tools you could do alot of work right there in the store and hey the tools are free and its heated inside (im in cold Canada) im sure they wouldnt be too thrilled with this though