I need to know the exact bolt size that connects the bottom of the header to the downpipe. I am getting 234234235 different answers, so if anyone knows for sure, please let me know

 

You mean like the dimensions? I could go measure, but its kind of a pain to jack up the car to measure. Why don't you just call RRM and have them tell you since it's their header?

 

Yes, I need the dimensions. And I did call up RRM, and Viczious told me the dimensions were 12mm x 1.25 x 40, but I am 100% sure those bolts are way to big to be 12mm. Thanks for anyone who can answer, I'm not really sure who to believe or what to do.

 

thats probably about right... isnt 12mm the size of the head on the bolt? whats wrong with that number?

 

That was the number I was skeptical about, I am being told 23407234 different things... and Home Depot said they don't even carry that size.

 

12 man... lol if the manufacuter (rrm) is saying 12 then it is what it is .

 

we used a 12mm bolt to take off the bolts when we installed my header 2 weeks ago

 

Home depot doesn't carry metric sizes. Get 1/2 inch. It's about the same. You'll obviously need a 1.2" socket or wrench to tighten them though.

 

kid_lancer_7 is right, you better listen to him. I think you can get them at Pep boys or Auto zone...

 

Yes they do, they carried a 12mm x 1.25 x 75 - that is metric.

 

yes they do. I spent an hour searching for screws there They have this measuring thing that you put the bolts in to measure what you have.

 

This is definetely not a 12mm head bolt.

 

are u just trying to replace the nuts n bolts?? just Wd-40 the hell out of them... cuz ur new ones will look just like what u see... b4 summer is over lol

 

NOPE. im trying to install my header, but I cant find the right size wrench to get those huge *** things off.

 

we just used a ratchet set..... if u have a pipe to put over the ratchet it will give u more leverage and the bolts will come off easier. install took about 1hr and some change. big thanks to imajinmyfx by the way