I wouldn't go bigger than 2 1/2". Mine were done by a local muffler shop 5 yrs. ago for $250. I supplied the 3 chamber Flows which cost me about $120 at the time. I use 1 1/2" primary Tri-Y headers. My whole engine is biased toward low end torque (350 lb./ft at 3750). This combo works well for me. 2 1/4" may work just as well. My system is NOT mandrel bent, so may fuction like a 2 1/4" system anyway.
Rev
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'66 Coupe, 306, windage
tray, TRW flat tops, 351W
heads,pocket ported, 268
CC hydraulic cam, R tip
R's, Edelbrock Performer,
600 CFM Holley vac. secs.,
Mallory Unilite, coil, fuel
pump, Tri-Y headers, 2 1/2 "
custom pipes, 3 chamber
Flows, stock C-4, 3.25
Currie built 8" rear,
March under drive pulleys,
13.97 e.t., 100.1 mph
1/4 mi.
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