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Why the heck is my car so loud? HELP!

753 Views 5 Replies 3 Participants Last post by  Guest
I've switched from Turbo Gold (generic) mufflers to Dynomax's Super Turbo (supposed to be quiet but free flowing), with little to no audible difference.


Dualed 302, stock manifolds, no h-pipe, chrome flowmaster looking tips welded on 2.5" aluminized pipes.

I was going to buy some sound deadener for under the back seat and over the differential hump.

Please advise.
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When I put dynomax super turbos duals under my '83 GT the guy told me that they would give a light rumble. BULL! I was setting off car alarms with it.

68 fastback, 390 4V premium fuel
80 5.0 hatch, just finished
91 5.0 coupe, daily driver
84 RamCharger 4x4 extreme mudsliger and winter junker
You should've posted a query before buying...

I run them on my race car and D-coder....I'd say quiet is an optimistic term to use, to say the least...

I'm going to extend the D-coder exhaust tips below the valence to see if that helps but I doubt they'll ever sound like stockers, to be sure...

I imagine the X-pipe on both dampens things somewhat but they both roar pretty good....only time the race car seems quiet is when I'm at the track and everyone else is uncorked..*G*

Have Super Turbos changed? The last set that I had (10 years ago) were very quiet until you went past about 3000RPM's. Is that not the case anymore?


64 1/2 coupe built around April 30, 1964
was a 260 3-speed becoming a 5.0 5-speed.
Can't tell you about late model ones....I did the D-coder in '94 and the race car in '95....bought everything from JC Whitney....think I still have an extra 2 1/2" one settin' up in the rafters in the shop...

Nope, they are pretty loud! The muffler shop said if I wanted to quiet them up, I should put glass packs where there would be cat converters!?
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