Vault BA5 • Helmholtz Resonator Example

So that 2.25" exhaust I made for my daily driver Accord in post 11017 has been bugging me since I made it. It has had a loud drone that peaks around 3300rpm, which sucks because that is a typical cruise rpm.

I was on the verge of buying a more restrictive stock style muffler because there is no room under the car to fit more inline resonators, but I decided to do some googling first. I found this thread and I decided to try making a Helmholtz resonator before throwing more parts and money at it.

I used excess materials from when I built the exhaust so I didn't have to spend any extra money to experiment with this. Here it is:





Sooo, results?

Fucking good!


The Helmholtz resonator completely transformed the exhaust! It worked way better than I was expecting. I thought it was only going to target around 3300rpm but I swear it also sounds better at idle as well.

It went from loud with an annoying drone, to a more aggressive version of the stock exhaust and no drone. All it took was a little more tube. Highly recommend trying one of these if you have a drone in your exhaust that you want to fix.

Statistics: Posted by MustardCat — 12 Jan 2019, 18:32

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