1/4 wave resonators are the way to eliminate drone without eliminating volume. Big mufflers with lots of packing do both.I'm experimenting tomorrow, this is the vibrant ultra quiet. I also have 12 bottle resonators if the ultra quiet is too quiet.
I have an h pipe with 12 inch resonators and muffler delete now. Too much drone and cold starts have gotten old.
I also want some volume and rasp gone too. I can weld this, my skills end about there!
Hope it works out for you.
Thanks. I think it will. Bottle resonators in the h pipe cut 75+percent of the drone. Its only 6th gear highway cruising now, and liveable.
I'd throw some packing at that, it looks like a mini roush muffler. it's probably too late to screen the other side to keep the packing in there, probably should have gotten a chambered muffer but lets see his results...I'm experimenting tomorrow, this is the vibrant ultra quiet. I also have 12 bottle resonators if the ultra quiet is too quiet.
I have an h pipe with 12 inch resonators and muffler delete now. Too much drone and cold starts have gotten old.
Nothing is welded yet. Those are vibrant resonators, the biggest they make. I'm also trying Magna flow 10416, and vibrant 12 inch bottle resonators. They have 198, 121, and 98 cubic inches of dampening.
Ah. Its been my experience they reduce the volume a bit, the 12 resonators reduced 6-8 db on this car, 18s did 8-10 on my twin turbo flex. So we will see.
Well yea if you make exhaust travel through something that long designed to reflect harmonic frequencies, you will get a reduction, 8 db isn't bad but imagine if you made it travel through a muffler of the same size, it would likely be much larger sound attenuation and depended on if it's chambered and/or baffled, it would even get rid of drone. Obviously we all like free flowing for the power, but the trade off is the noise.
Nice, it does sound similar to other 3.5s with some boltons, still it's not too loud, turbos really do a good job of limiting exhaust noise, it's like a sponge soaking up most of the noise from the exhaust pulses. Post up pix of your setup when your done, do you have LTH or anything else just catback?
Bottle resonators do reduce peak dB some and tonal harshness. They mostly target higher frequency sound, not the low frequencies that produce drone. It's not a big change but definitely enough to be noticeable and measurable.