Glasspacks getting quieter with age?...WTF!?!

Pop's ride has a built Cobra 289 mill with side exiting exhaust and really short racing gl***packs. When we first put them on was when we got the engine back from being re-built. It literally sounded like a jet pulling in. The car might as well have had open headers. Gradually over the years it has gotten quieter and quieter. Now it still sounds great, but its just a rumble compared to the way it was. I thought gl***packs got louder if anything with age? Think a new pair would bring it back to its abnoxious glory?
-Dean

 

maybe your neighbors have been stuffing stuff in them?

 

Maybe you are going deaf.

 

Sounds to me that the engine just broke in is all, gets a little quieter. Just cut the pipes off and go uncorked.

 

you'd never get outta camarillo like that!

 

Maybe he wore it out and lost compression?

 

That was my initial thought as well, but for his wallet's sake i certainly hope not!

 

I remember driving a truck home that had them and as soon as I got home we shoved a water hose in them and turned it on high! I was sixteen and that thing was loud ,it had a granny 4speed and you could here me gearing that truck down miles away , Dad always knew when I came home late.

 

Gee your self a hose and put some water in those gl*** packs, let um sit, then come out in the morning and turn her on and blow all that water out.

Or do you live near some hills or mountians? Take a drive.

 

Burnin Oil-Is that a primered Custom 300 I see in your avatar?

Lets see some pics of that car!

As far as the exhaust goes, you think sleeving the gl***packs would do it? Just open pipes right out the side.
-Dean

 

When they were new,there was a smaller diameter pipe inside,with saw cuts. Around this was packed almost solid with fibergl***,thus the pipe had higher velocity exhaust gas really pushing through it and 'roaring'. Now that inside smaller pipe has rusted away,so the whole thing acts like a big'rumble tube' mellowing out the note. When this happened to me,as a kid I shoved metal vacuum -cleaner extension tubes in them to sharpen up the tone. Notice how I used the words'mellowing',and 'tone',words I learned from all those muffler ads in HRM,in the 60's My theory anyway,that concludes the lecture..Sparky Poor Boys cc p.h.d.