I'm looking to replace the current aftermarket cat back exhaust system on my car (was on my EP3 when I purchased it) with an OEM B pipe and back box. I already have a new doughnut gasket and 2x nuts, bolts and springs to connect the the OEM B pipe to the back back and new 3 hole gasket that sits between the OEM cat and the B pipe but can anyone advise what size nuts and bolts are needed to connect the cat and the B pipe (has a 3 hole triangular flange)
Thanks