Not being very familiar to flowmaster exhaust systems, I seem to have a 2.5 to 3 inch single exhasut system w/ crossover muffler and 2.5" outlets. I haven't really heard of a setup like this and it seems odd,mainly because the intermediate pipe is not mandrel bent and appears to actually be around 2.75" in diameter, i could always crack the weld and check or try to convert circumference to diameter but i dunno maybe you guys hav some sort of explanation. The pipe doesnt seem to be very high quality considering it has some ugly kinks in it and honestly the car doesnt sound that good and it stutters at high rpms. The whole system is fully welded and even though the y pipe is really nice lookin im thinkin of just puttin some 45 degree pipes on my shortys and angling a muffler behind each front tire. Man that pipe looks *** . Just seems a shame to dump all of it along with the welded in high flow cat etc. Maybe it'll be cool sayin i got true duals...

anyway look at my sig and you'll see my mods plus it seems like i got a cam one up from stock but im not sure of the grind.

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'86 Camaro z-28
Carbed 350
Shorty Headers
Flowmaster Exhaust
B&M Shift Kit
Borg-Warner SuperMag wires