Hi! My rear test pipe bolts fell off. I was wondering if anyone knows what is the size of them? Not the two spring bolts that connects to the manifold but the three rear bolts. I know it’s 14mm but what is the length of the bolt? Can I just go to a hardware store and use those?

 

Bolts or nuts? All three (3) "fell off?"

No telling what they were since there are threaded studs on the OEM catalytic converter flange so you can use anything you want that fits. Stainless steel typically has a higher temperature tolerance than mind steel and shouldn't rust.

-- Chuck

 

They are M10

Something with like a 35 or 40mm length will do the trick

 

And use spring washers this time

 

No, he said he needs the hardware toward the back of the car. He said the ones with spring washers are still intact.

 

My Berk high flow cat does not have the studs either so I used these stainless steel bolts and nuts. Don't forget lock washers on the nuts. I got them at Lowes or Home Depot ten (10) years ago and they're still on the car.

As @B serious notes they're M10.

Bolt: M10-1.25 x 40mm
Nut: M10-1.25

-- Chuck

 

Yes i know that,
washers are needed at rear or the correct nut <not nylock,as they will melt>

 

Also use anti-seize compound on the threads. That makes it easy when they are removed. I prefer the copper version of anti-seize compound.