Searched and found nothing other than the stud size shown here http://www.mazdatrix.com/e7.htm under exhaust studs. Doesnt say if it fits our cars. Just need to know size so i can get the right ones before I replace the bad gaskets. I know they are rusted and will involve cutting or breaking the studs.

 

your replacing just the studs on your cat?
should be 14 IIRC

 

Yeah why? Have leak and got gaskets from racing beat and know the studs are rsted and i will get some nuts also.

 

try pb blast and a torque wrench and you shouldnt have a problem getting them off. also try a blow torch to expand/contract the bolts.