Catalina Exhaust Drone 1970

[melrose_garage_inc]

I had one of these back in the early 80's with a 350 and the exhaust/engine noise was too much inside! Now I just got another one. What works best to reduce the interior noise? I am looking into dynamat type products. Anyone have any luck with making things quiet inside?

[Mike Nixon]

TRy a quieter muffler or a set of glas****ks hung in the tailpipes as resonators?

I grew up in a 69 and never noticed it.

MIke

[Les Iden]

Mike has the right idea: my 462 powered GP has Doug's headers, 2.5" x-pipe, 2.5" X 18" Magnaflows, and full length 2.5" tailpipes, all mandrel bent. I had a terrible resonance inside the car as soon as the trans shifted into top gear @ around 30-40mph. After trying even more restrictive mufflers w/o success, I installed 2.5" inlet X 30" case length, bullet type glas****ks which totally removed the resonance. I butt-welded them into the tailpipes on each side of the gas tank as resonators. I attribute the change to altering the harmonics of the really long exhaust system on this big car, moreso than the quieting of the exhaust note which seemed the same.

Les

[Mike Nixon]

Like Les my 65 G/P with 2.5" exhaust and Pypes Race Pro mufflers would rattle the trunk floor from 2100 to 2500 RPM. I installed a set of glass packs in the tailpipes and the problem is solved.

MIke

[Frankiee]

Like Les my 65 G/P with 2.5" exhaust and Pypes Race Pro mufflers would rattle the trunk floor from 2100 to 2500 RPM. I installed a set of glass packs in the tailpipes and the problem is solved.

MIke

Hey guys, this is my first post to this website and I know this thread is a few years old but figure I'd hit it up and see if I get any responses.
I just recently purchased a 1970 Catalina Station Wagon ( cheap BDay present to myself). The exhaust is totally shot. I know I can't find headers for this car (I've tried everywhere) so if I were just to replace the exhaust (manifold back) I was thinking something fun like a set of Flowmaster 40's, dump the pipes right out the side near behind the rear doors (if possible) but after reading your responses and having a 68 Bel Air some years back with Flowmaster 40's ( no carpet) I understand the loud droning sound one would experience while hauling at a good speed so figured I'd just get another opinion.

Also- when you say Glass ...cks- is there any specific brand? Would generic NAPA ones work?

Thanks, Frank