The systems on the AAR's & T/A's were dual 2.25" - I own an AAR, though it is not ready for the road yet - still under a tedious restoration.
The OE mufflers (reverse flows) are just a poor internal design so they flow like crap - 175 CFM per muffler.
We flow tested one of them when I worked for Dynomax, that's where I got the CFM flow #'s from.
Compared to a Dynomax # 17675, which has a flow rate of 517 CFM.
I would not hesitate to run this Super Turbo on your car, as it has a VERY good flow rate. The 2.5" version of this same reverse-flow muffler is part # 17676 (the 17675 is a 2.25" in/out) & the 2.5" version has a flow rate of 539 CFM.
These are a standard oval size (4.25" thick x 9.75" wide), x 14" long bodies, so they are shorter than the OE AAR/T/A mufflers by 6".
Eric Sauls
President – CCEI
Classic Chambered Exhaust, Inc.
P.O. Box 424
Milford, MI. 48381
Phone: (248) 889-4364