Fancy Tech: How to Get Rid of Exhaust Drone, works great!

'10Anamoly

You would want one side branch per 2.5" exit pipe after the mufflers. The direction does not matter for the branches but the length and location do (anywhere after the final resonator or muffler is fine). I would use 36-40" to kill drone in that range. I would note though that you may eliminate 80% of the drone range but not all since this only affects a short frequency range. It should help plenty though. You can always test different lengths of pipe (make the welded elbow and then clamp on different extensions) to see which works best and then weld it permanently. They do have to be capped at the end of each branch too, no packing inside though. The diameter of the side branches should match the diameter of the primary exhaust pipes.

PS - nice numbers, what turbo did you swap in there?

__________________
2013 Ford Mustang GT

374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

Satheian

Thanks for the advice and quick response, sorry about my own delay getting back to you.
I've done some more testing since reading about this and it's actually more in the 2-2400 range, so now I'm thinking 34 might be a closer match. I've also noticed a similar drone-type noise/vibration around 3500-4k which doesn't bother me as much since it's not a cruising range, but I was wondering if throwing a 12inch or so pipe might help eliminate that as well.

And to answer your other question, gt3071r, tuned with AEM fic.
It doesn't start spooling until about 35-4k with full boost just over 5k, it would be a lot of fun except my rev limit is still 6500ish (sometimes it slips over sometimes it doesn't *shrug*) so I don't get a lot of time to enjoy it, but it's also been under 40degrees the whole time I've had it, so maybe with the warmer weather it will behave better? Or I might just need a better tune.

I didn't want to clutter up your thread with too much information on my own car, so I just threw that number out there so it was understood that the car isn't stock.

'10Anamoly

Sounds nice bud.

__________________
2013 Ford Mustang GT

374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd