I installed my header-back exhaust about a week ago, it sounds and performs amazing! Except for an insanely annoying drone in the 1500 to 2500 RPM range. It annoys my ears and pretty much ruins any music I want to listen to. I am automatic BTW. So I was reading around the interwebs about solutions and there really only seems to be two:
A) Install an resonator (inline) after the cat like in a stock system
B) Add a quarter-wave resonator (perpendicular) to the exhaust pipe
I am leaning towards B because I love the way my exhaust sounds, except for the drone. A 1/4 wave resonator is designed to cancel out certain resonant frequencies in the pipe, and can be tuned to any frequency you want. I found a lot of hot rod and truck forums discussing this, as I am sure that the drone on a big block would be even more insane. I want to design mine with a trombone style tube so I can tune it to perfectly cancel out my drone. I am thinking I will have room for it in the back next to my muffler.
If I went with A: I think a standard resonator (probably Vibrant brand) it will kill a lot of the tone, which I want to keep. Plus, a standard resonator costs around $60 and I think that's stupid. It's basically an expansion chamber and to me it's not worth the money. I could always build one, but I do not think it will fit my need.
My current setup:
Pacesetter Header
2.25" pipe all the way
Vibrant high-flow cat
Borla straight-through muffler
Here are links to the best threads I found:
I did it. Eliminated the 2000 rpm exhaust drone - Hot Rod Forum : Hotrodders Bulletin Board
How to build an exhaust resonator tube to eliminate drone - PerformanceTrucks.net Forums
Anybody here ever have experience with this idea? It's news to me and I am glad I found the option before I threw away money on something I didn't need.
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