Flowmaster 40 series muffler comparison

1963 Ford Falcon - 260 V8
Exhaust - Standard '63 Windsor manifolds, 2" Dual exhaust with H pipe
Quick Fuel 450 CFM Slayer Vac Secondaries Carburetor.
Thompson Performance Powerblast Plate
RPC - 4 Hole 1" Phenolic Spacer
Edelbrock Performer 2121 Dual Plane Manifold.
Crow Cams - 15602 - 208/208 @.050 LSA 110.
Original heads rebuilt - Springs, Valves, Guides etc.
Felpro Gasket kit.
Rollmaster Double Row Timing Chain Set.
Radiator - Aluminium 2 core high flow OEM look - 1.25" cores.
2 speed Ford-O-Matic
Ford 8 inch differential 3.25:1

[@rogerbennett2025]

nice .. not all crazy and blasty loud.. but when you put your foot into it .. they seem to come alive

[@paulsmallz1563]

@rogerbennett2025 Thanks bud, yes happy with external level, a little louder than the other two mufflers but not silly. Internal resonance no real difference between them all. Im noticing no drone at speed with the Flowmasters which is surprising. May be due to being a 2 inch system.

[@paulplack490]

I'd love to see these options compared on a dyno, to see if there's a meaningful performance difference. That's a sweet Falcon!

[@paulsmallz1563]

@paulplack490 cheers bud, agree would be interesting to know. I landed on the Flowmasters purely for the exhaust note. Engine is lucky to have 170-180 crank hp. With the 2 speed, probably wouldn't notice the difference over a few hp.

[@paulsmallz1563]

Flowmaster exhaust from 0:54 seconds. Exhaust - '63 Falcon Windsor manifolds, 2" Dual exhaust with H pipe