Question about rattle in CR sidepipe

[moore_rb]

** EDIT - After typing out all the stuff below, I remembered that I still have my original Classic Roadster sidepipe mufflers taking up space out in my shed - If you want to return your car's sidepipes to exactly the way they used to sound and perform, then send me a Private Message, and I'll make you a KILLER deal on these **


If you want similar noise volume levels to what you had with the original CR mufflers, and also want to free up some Horsepower, Order a pair of Flowmaster Slimline sidepipe mufflers - These are the quietest, free flowing sidepipe mufflers you are going to find.

watch this vid for some sound clips:
[ame]https://www.youtube.com/watch?v=HlDiQkWNhIY[/ame]

The ClassicChambered Cobrapacks are glasspacks, but they utilize a proprietary inner baffle design which improves flow- But they still sound like a glasspack - They will be lower pitched than the CR mufflers were under part throttle (more bass, less treble), and even with fiberglass packing, they are going to scream loud (90dB+) under WOT (My original ClassicRoadster mufflers tested at 80dB under WOT conditions)

Regarding re-tuning your EFI... it's possible that the WOT speed density tables would need to be richened up a bit, but probably not. For part-throttle cruise and idle conditions, your O2 sensors will allow the computer to re-adjust itself.

[Shootnride]

Jones Exhaust also makes pretty much the same muffler as the Classic Chambered. They are available through Summit Racing. I put a set on my car and they seem to be fine.

If you weld in new mufflers, the remaining ceramic coating has to be stripped and and the sidepipes re-coated.

You may have to do a little carb re-tuning if you install new less restrictive mufflers. If you're going to the trouble and expense of cutting, welding and re-coating, you might as well put in some good low restriction mufflers.

Ted

http://www.jonesexhaust.com/products.cfm?ProductTOC=10

[moore_rb]

Originally Posted by Shootnride

Jones Exhaust also makes pretty much the same muffler as the Classic Chambered. They are available through Summit Racing. I put a set on my car and they seem to be fine.

If you weld in new mufflers, the remaining ceramic coating has to be stripped and and the sidepipes re-coated.

You may have to do a little carb re-tuning if you install new less restrictive mufflers. If you're going to the trouble and expense of cutting, welding and re-coating, you might as well put in some good low restriction mufflers.

Ted

Agree- I'm also using 24 inch Jones mufflers on my converted sidepipes, but I didn't mention them because the original poster suggested that sound levels were a concern for him; and both the classic chambered cobrapacks, and the jones glasspacks are both pretty loud when you stand on the throttle.

But I totally agree that in terms of cost and performance gain, Jones glasspacks are the absolute best "bang for the buck" option available.

The correct 30 inch Jones muffler to use with a 302 EFI engine would be number A4530B, with a 2-1/4 inch core:

https://www.summitracing.com/parts/jex-a4530b