Boy am I late on this one.
Anyway. I installed a Magnaflow system on my 73. It comes out of the stock manifolds at 2 1/4" and enters a X-pipe which increases the pipes to 2 1/2" all the way through to the mufflers and out the back staying at 2 1/2".
The system is Stainless all the way.
I did have to modify the mufflers outlet to except a tip out the back of my car to match the original setup. I then purchased tips with the 2 1/2" pipes.
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Brian - NCM Lifetime Member
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box