Need advice with new exhaust set-up
11-03-2017, 07:12 PM
#21
Staging Lane
Thread Starter
Drone happens even on Corvettes and Gen 5 Camaros with bullets. You need enough absorbing material to absorb the sound waves. Guess what... F-Bodies don't have a lot of space for large enough mufflers (need a 6" canister at min).
But the issue with the Kooks and Speed Eng duals is pretty simple - they put the mufflers at the end of the pipes. You need the mufflers in front of the axles and a good 2' of pipe after them to really cut the drone. By putting the mufflers on the end of the exhaust, you limit their effectiveness.
I put 6" round, 14" long Dynomax canisters on mine. And it is certainly better. But it is not at all drone-less. It's still insane. And for some reason, my car is louder than most other people's. I was seeing 105db at idle. Now I see 94.
But the issue with the Kooks and Speed Eng duals is pretty simple - they put the mufflers at the end of the pipes. You need the mufflers in front of the axles and a good 2' of pipe after them to really cut the drone. By putting the mufflers on the end of the exhaust, you limit their effectiveness.
I put 6" round, 14" long Dynomax canisters on mine. And it is certainly better. But it is not at all drone-less. It's still insane. And for some reason, my car is louder than most other people's. I was seeing 105db at idle. Now I see 94.
11-03-2017, 08:44 PM
#22
True duals on these cars sound great. But to daily drive the car and be able to hear the stereo, means it needs a little bit of help to tone it down inside the car. The hatch also acts as a giant reverbaphone - so adding sound deadening material there helps.
One thing the UltraFlos did was add tone. The bullets don't really do much. It sounds harsh and tone-less and even raspy.
The UltraFlos made it deeper.
One thing the UltraFlos did was add tone. The bullets don't really do much. It sounds harsh and tone-less and even raspy.
The UltraFlos made it deeper.
11-23-2017, 09:38 AM
#24
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I used flowmaster dbx. Similar result as Jake.
11-23-2017, 02:50 PM
#25
I have three different layer of sound deadner from the firewall to the very back of the hatch. I should have dropped the tank and gotten the under side of that also. Believe me when I say my car is WELL insulated and the exhaust drone still penetrates like a bitch.
11-23-2017, 10:54 PM
#26
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I believe you. Its basically twin organ pipes under there unless you do something to break that pipe up. That is why you need resonators. And why cats will help. Changes the frequency the pipe resonates.