hey i was putting on the new headers on my car. the bolts that attach the downpipe to the cat were gone and we had to torch them out. so does anyone know the size of these 3 bolts?(the ones that connect to the cat).

 

More than likely, they're M8x1.25.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 117 &raquo;</TD></TR><TR><TD CLASS="quote">More than likely, they're M8x1.25.</TD></TR></TABLE>

Are you thinking off the nuts that screw to the studs in the head because those are m8x1.25. That just seems like it would be kinda small on the downpipe, i could be wrong though.

 

They might be M10x1.25, but that seems a bit large.

Either way, they're M8x1.25 or M10x1.25.

EDIT: Now that I think about it, I'd imagine they're M10x1.25 on the cat.

 

alright so m10 or m8? alright ill try them

 

if you had to cut them off, just go to the hardware store and buy some regular nuts and bolts and call it a day. It's how I have my cataylic convertor bolted on and workes just fine

 

yea thats what i ended up doing awhile back those bolts were a bitch. I would personally get stainless bolts and nuts if possible, it will most likely save you some headaches in the future.

 

so what nut and bolt size do you recommend? lol and ya those things were so rusted that we had to torch em out.

 

so i went to menards and got some #1/4-20 1 1/2 long 1/4 dia bolt and nuuts. you think thouse will work?