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I get a rattle when I rev the motor in my 66, actually the rattle happens when the RPMs are going down. I had always assumed the pipes were hitting something under the car or the trumpets were banging the openings in the valence. I looked a few times last year but never found anything hitting, I thought it was just a Ford thing. This weekend I put the distributor back on and I had the timing a few degrees off I got a helluva pop through the pipes and it sounded like there was a ton of junk rattling around in the pipes. I don't know how I am going to fix it yet but it feels good to finally make some progress.

I should just replace the whole thing. I am leaning towards 2 channel flows with duece and a half pipe. Would that be overkill for a C code? I figure it would be pretty loud (good thing) but would it be louder than the shorty glass packs it has now? Also if I upgrade the system should I stick with the louvered GT trumpets or go with a less restrictive tip? maybe some big old rice style coffee cans duct taped under the valence? LOL!


66 Coupe
C Code
http://biology2.biosci.wayne.edu/dave/must/st54.jpg
 

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Your assumption of overkill isn't far from the mark. Retaining the two barrel carb, a 2 1/2 inch exhaust would be way too much and likely hurt the torque of the engine. A 2 inch pipe, traditional turbo mufflers would bring out the best in your case. While the louvered exhaust tips are a little restrictive, you shouldn't see much if any impact coupled to the two chambered Flow Masters you are planning on using. Soundwise, I don't think they would be much different from your current exhaust

Tom Kubler, Long-time Mustang Enthusiast & San Antonio Mustang Club Founder
 

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I would bet that the rattle is the broken fiberglass banging around in your glass pak mufflers!

1966 Coupe - GT - 4 speed
http://www.workforcescc.com/pdf/Side4.jpg
 

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We've changed the exhaust around on several (five) Mustangs and Falcons, and the thing that surprised me is exhaust noise also is dependent on how hot the engine is. I am not sure how loud your car would be with two chamber Flowmaster and 2 1/2" exhaust, but it isn't going to be nearly as loud as you may expect. It will, however when engine speed increases, identify itself as sort of a stock engine by the sound. Sort of like wearing short trousers and showing off skinny legs.

My suggestion: Consider what your overall goals with the car is and what changes are necessary to make those goals. If your goals include a pretty hot engine, then consider which exhaust system makes the most sense.

Sorry about the preaching. It's just that I have been there done that, then done that again and gotten more experience than I wanted.

Russ

PS I surely does sound like flaked off rust in your muffler. Also, been there, done that.

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