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That's actually a fairly common way of checking for exhaust leaks on piston engine aircraft. Lots of single engine planes use a heater "muff" around the exhausts to supply cabin heat so carbon monoxide can be an issue.

The counterclockwise is important, remember, you're trying to loosen the POS. Dave

Soak it all with Kroil or PB Blaster for a few days. Find every wrench, socket, extensions, universals and ratchets in your entire garage that are the correct size for the hardware. Circle the car three times counterclockwise while cursing loudly. Find plenty of light and drag all the crap under...

I finally changed my mufflers to the Walker's suggested earlier in this thread. At idle they sound very similar to the Flowmasters, a bit quieter at full throttle. Keep in mind this is a little 273 with an automatic. Still a deep tone, slightly deeper than the Flowmasters. The miserable pain in...

I just ordered the Walker Dynomax suggested above. It'll be at least a couple of weeks before I get time to install them. Will post up thoughts when done. Dave

IMP 33, Thanks for the suggestion, at first look it seems the Walkers would fit. Got to get it lifted and get under there and check the space but thinking your recommendation would be good. Dave

Ok they're Flowmaster part number 842451 about 17in long 2.25 in tubes. I'm going to find a print with offset and total length and try to find something a bit longer. They're welded on so I figure to loose a bit of pipe on both ends taking them off. Thanks for the ideas. Dave

No worries, I didn't look that close. Going to be changing the headlight switch tonight and I'll crawl under after and get the dims and numbers off them. Dave

Thanks for the reply's. They're Flowmasters, the numbers are on them but I didn't look that close. From my eyeball size recollection I'd guess them to be a 50 series. Based on the comments I think cutting them out and finding some different mufflers will be the direction to go. The tuned J...

Hi all, Have a 66 Belvedere 273 V8 auto. Previous owner spent some money on a nice full dual exhaust using Flowmasters ( unknown at this point which ones ). Anyway, the droning sounds at what's basically everyday driving speeds is very unpleasant to my ears. Before I cut em off and redo the...