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I'm skimming through the weekends posts, and read your's regarding loud Flowmasters. Just wanted you to know that I'm running flowmaster 3-chambers on 2" exhaust on my 66 with a 302. I think mine is considerably quieter than yours (based on 10 hours in your 67 last month). Of course, part of this could be due to the soundproofing of a coupe Vs. a vert, but even from outside the car I think there's a considerable difference. Before you toss those flowmasters, you might want to inspect the whole exhaust system to make sure everything is isolated properly. I remember right after I had my system installed it about shook my teeth out. I found one header tube in contact with the shock tower. Once I fixed this, the tone went to a pleasing, but not annoying, growl.

Good luck!

DanM
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Mine are too loud too. I just got back from looking at a friend's '65. He has flowmaster 3's but he put resonators behind them and it sounds great--quieter than mine with a low growl. Now I need to figure out where to get the resonators.
 

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A couple of things I've kinda discovered along the same lines as you're saying:
Make sure your exhaust hangers have a rubber bushing or something, I know the ones my exhaust shop installed have a huge rubber strip, this cuts down on vibration too...
Alot of difference can be made by the tailpipes. Mine exit straight out the rear past the valence, and I get NO resonance at interstate speeds, and I have 2 chambers. If it dumps under the car or you have turndowns or something, it makes resonance worse.

-Jason

'72 Mach 1 || '90 Talon TSi AWD
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The difference between 2" exhaust (very small) and 2.5" can be night and day as well. Are you really running 2" with Flowmasters on a 302? A non-mandrel bent 2" system probably results in a 1.5" system... that is very restrictive.

A crossover will also change the sound/tone depending on which type you go with. My experience with the X-pipe is that it increases the tone to a higher pitch, while a traditional H will quiet the system down a bit without affecting the tone much at all.

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When I installed a dual system last year I had many sleepness nights. There was a very strong resonance at arround 50 - 70 mph. I even considered to go back to a single system. Then I discovered that this was all due to a resonance between the turn down tips and the rear valance panel. After lowering the end of the tips a few centimeters the resonance was completly gone !!
BTW I have those cheap Thrush Calafornia mufflers.....



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