The American Thunder system Flowmaster sells now comes with 2 chamber, 40 series delta flow mufflers. My system in 2000 came with 3 chamber delta force rather than the delta flows design they sell now. Offset/offset is what A body needs. Mine are not too quiet.. Could be the cam & compression tho....
I think a jpipe setup is my next step. I’ve got a spreadsheet with the formulas in it. I was going to do that first, believe it or not. But get this… I was worried I’d get the math/measurements wrong and built a quarter-wave resonator that missed the most droney part and quieted the wrong frequency. I guess I could build an adjustable one (trombone anyone?). I’d have been done a loooonnggg time ago had I just done that already instead of throwing money and resonators at it. tonight I put all four resonators in, ultra quiets up front and race bullets in the back, sticking out from under the bumper… and the drone is still there. I’m so so tired. Next chance I get I’m taking all those resonators out and going with jpipes somewhere in the system. Maybe in the tailpipes. I would take a chance and get different mufflers but I’m thinking it wouldn’t make much of a difference. There are so many conflicting opinions on which ones are best but I think it’s the pipes themselves.
Thanks! I’m either resilient and persistent or a simple glutton for punishment. My wife thinks it’s the latter.
This string of post seems to be going on forever, so here's a possible solution that likely has not been offered. You can find these now even without looking too hard. Buy a Tesla that's been hit hard and insurance has totaled it. Cut the frame and weld it into your car along the electric motors. You have a big car so there's plenty of room for the battery's. Then install a digital sound system with sampling and a 500 watt amp and two Sub wofeers , you can then have your car sound like anything from a 10,000 hp top fuel rail to 2 hp Briggs's and Stratton by loading up different samples.
I was able to reduce drone a lot by putting some glasspacks just prior to where the tailpipe exits underneath the gas tank (leaving the existing mufflers in place as a complement). They barely added any flow restriction but did a nice job of cutting back on the drone. -Bob C.
thanks Bob. I’ve tried that. Figured it’d do the trick but it hasn’t. It’s been pointed out that this thread has been going on forever with no resolution, and since I’m not going to Teslafy my Buick to solve this, and I won’t put a 1” exhaust on it either, I’ll stop sharing what’s going on with my attempt to get rid of the drone and post again when I’ve successfully done it. Hopefully sooner rather than later. Thanks all for your indulgence as I shared my trip through the gauntlet of drone. See ya on the droneless side!
if you decide to change mufflers these will work same size as the Dynomax. walker WLK-22393 summit racing has them or shop around. then sell your Dynomax since a lot of guys like them.
I have been watching since post 1. To me this problem is no different that an ignition / fueling / timing / brake / suspension problem that people work through. Some of us learn more by watching the process / progress than a few sentences of the right answer. I would ask that you keep posting the journey.
Thanks. I’d stumbled across those and wasn’t sure they’d be any better so I didn’t order them until I exhausted (pardon the pun) all combinations of resonators and placements of what I’d already bought. I decided to remove the resonators and try the quiet flows so I ordered them off Amazon and they’ll be here Thursday. I’ve gotten faster at removal and replacement and reconfiguration through repetition. Should be a breeze to swap in the quiet flows. Just jinxed myself.
Thanks for that. I appreciate it. I too prefer to read the step by step through a journey rather than “here’s what solved it” because I wonder if they tried A, B, and Z first. Then I know what route NOT to take. Maybe. I don’t always learn the first time.
Yes, same ones. Amazon has no description of specs and the wrong image but when I looked at them at Summit that confirmed the specs.
there the right ones good price too. if it works out i told you so if it still drones it was your ideal. lmao
I'd suggest the trombone. 18-24" should get you into the range and you can make it so you can also shorten it if needed by flipping the slide around. (putting the cap end into the J) A few on the BritishV8 forum have used it successfully. Jim
Imagine the horror of doing that while leaving a Sunday morning Cars & Coffee. Before I go, does anybody need their bagel toasted?
