March 7, 200520 yr Anyone know what the stock exhaust bore diameter is ? and if it varies then im specifically interested in the bore size of the pipes between cats and backbox. Ta. :)
March 8, 200520 yr Anyone know what the stock exhaust bore diameter is ? and if it varies then im specifically interested in the bore size of the pipes between cats and backbox. Ta. :) If memory serves me ... 2.5" bore. A lot of aftermarket exhausts (like B&B triflows) will be 3" for TT's and 2.5" for NA's but when I had my exhaust fabricated the pipes used had a bore of 2.5". HTH. Dan
March 8, 200520 yr Right, just been out to measure mine in the garage 2 1/2 inch on a twin turbo zorst bud, alot of people go bigger but there is no need to, as this is optimum. Alot of Zorst places use the 2:3/4 inch pipe work and bigger back boxes but if you want to loose your back pressure :confused:
March 8, 200520 yr Author Excellent, thanks guys. I've bought a pair of 2nd hand 3.5" Tipped cat back boxes, with 2.5" bore pipes , but the previous owner had cut them off just before the cats, so wanted to check that the bore size would match for welding on.
Anyone know what the stock exhaust bore diameter is ?
and if it varies then im specifically interested in the bore size of the pipes between cats and backbox.
Ta. :)