does anyone know the bolt and nut specs for the 6 bolts from the manifold to the cat/test pipe? I want to get the nuts boltslockwashers before I take off my cats and install my t/p I'm sure I will have to break one off @ least knowing my luck thanks guys!! Would it be the same nuts and bolts that the 2 bolt flanges use?i put cbe on my car recently and I could easily take out one of those and take it to the store

 

you can go to auto zone or home Depot/ lowes and match them to the size of the bolts that would remain in the cats after dissasemble. i usally go to autozone or pepboys the universal exhaust bolts works excellent for me you can thread them into the stock header or cat or testpipe however ur setup design. they are gold and comes with nuts u may need 2 sets of them
also included with universal gaskets but i never used the gaskets, just the bolts. oh btw they are 14mm nut and bolt
i ran them on my g35 coupe and running them now with my new setup over stock.
good luck and hope this helps.

 

Thank you!!

 

Found this in the diy section for hfc If one does come out of the header you can use a hex cap M10-1.50x40 to fill the spot.

 

A couple tips that will help if you haven't heard~Use a 50/50 mix of acetone/ATF to soak the bolts 24hrs prior, this is the best rust breaker there is. Also use copper based anti-seize on the new nuts& bolts, will make removal easier and keep rust at bay.
And I listed some other tools that made the job easier here~
https://www.myg37.com/forums/g37-sed...y-be-atch.html

 

Got the car on jackstanda with bolts soaking now just had stealership replace passenger side about 6 months ago for free thank god only drivers side 3 bolts should be a pita will let u know tomorrow thanks guys!

 

good luck and dont get stuck under the car for too long. the only side thats hard is the driver side top bolt close to the knuckle.
u may need a long extended adapter and hit it from the front remove drive side intake unless u can u from bottom.

 

Broke the demon bolt one try all the other bolts came out no problem now I have to get the broken stud drilled out so I can put cats back on to do emissions test in aug thanks guys! Acetone and transmission fluid is the best rust breaker ever

 

Nice Christmas gift^^^Glad it worked out

 

Have to do it all again the end of April to pass smog check lol I thought my tabs were good til aug should've re registered my car first fml haha

 

glad it worked for you yeah that demon bolt on the driver sides a nightmare. i had to cut my cat out from the bottom leaving the flang still attached them i had to remove the headers.smh its not that bad if u done it before but the angle to get to them header bolts on driver side omg .
glad it worked for you.

i dont know uf u attend the meets here in L.A. but we stay going.with the g's and z community.

 

Just relocated to Las Vegas...

 

lol thats crazy we was out that way for Christmas.

 

So when I installed my test pipes I broke the drivers side top stud should I take this cat to a shop and have them drill and tap this cat and put me a new stud in place of the old one or just drill it out and use a bolt? Asking because in may I'm going to have to put cats back to pass my smog test thank you guys!!!

 

if the bolt stil remain get it tapped and replace for future swap.