Exhaust Drone
Thread Starter
Heel & Toe
Joined: Sep 2021
Posts: 19
Likes: 5
Exhaust Drone
Had Billy Boat 2.5 cat back system installed recently on my 95 6spd, knew to expect some drone more than I expected. Have installed lot's of soundproofing inside rear deck floor and surrounding areas. It's ok with open windows , closed of course another matter, 5th gear low speed worst rarely use 6th.
Any ideas?
Any ideas?
Racer
Joined: Apr 2020
Posts: 297
Likes: 169
From: Mooresville, IN
2026 Restomod of the Year Finalist
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Absolutely a real source of drone. I put a set of reproduction mufflers on my car, the one difference from stock being dual working outlets. The drone was horrendous for such an otherwise quiet exhaust.
Pro
Joined: Jun 2018
Posts: 532
Likes: 104
Had Billy Boat 2.5 cat back system installed recently on my 95 6spd, knew to expect some drone more than I expected. Have installed lot's of soundproofing inside rear deck floor and surrounding areas. It's ok with open windows , closed of course another matter, 5th gear low speed worst rarely use 6th.
Any ideas?
Any ideas?
you can try putting a resonator in place of the rear cat, that might work, but quieter mufflers are the only way to reliably eliminate exhaust drone.
I have also found that if the car sounds awesome from the outside it generally drones in the inside.
Pro
Joined: Apr 1999
Posts: 533
Likes: 6
From: Poinciana Florida
Loud B&B Drone
Go to the local hardware store. Buy a pair of galvanized plumbers pipe plugs.to match the interior of the B@B pipe outlet. Install the plugs in the two INNER exhaust outlets. This should stop the drone. Also, stay away from an X pipe. The exhaust noise will drive your neighbors nuts.
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
Ditch the BB get yourself a set of long tube headers and reinstall the stock 95 dual exhaust. Will sound better & NO drone.
Only other good choice for no drone is a Corsa system.
Only other good choice for no drone is a Corsa system.
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Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Bought as set for my C6....at the time ('07 ish?) they were the hands down, #1 recommended muff on the 'Vette forums. They DID eliminate drone, while allowing more sound than the stock mufflers. However the sound was "eh", the fit and finish on the mufflers was fair (later got GHL mufflers and they were much better built...and sounded better too). The Corsa's were heavy and finally, they co$t as retarded amount of money for ANY muffler, least of all on that is "eh, eh, eh."
Drifting
Joined: Jun 2020
Posts: 1,355
Likes: 396
From: Northwest Ohio
Bought as set for my C6....at the time ('07 ish?) they were the hands down, #1 recommended muff on the 'Vette forums. They DID eliminate drone, while allowing more sound than the stock mufflers. However the sound was "eh", the fit and finish on the mufflers was fair (later got GHL mufflers and they were much better built...and sounded better too). The Corsa's were heavy and finally, they co$t as retarded amount of money for ANY muffler, least of all on that is "eh, eh, eh."
Burning Brakes
Joined: Mar 1999
Posts: 1,150
Likes: 138
From: Raymore Missouri
I've had a B&B 3" on my LT4 since 2002. It drones. I thought the 2.5" was supposed to be better, but I'm not surprised it's not. I really love the looks of the B&B, but I definitely have contemplated something different over the years. I knew about plugging the inside outlets and may go do that, thanks @RVY for the suggestion on what to use. There is the new Fusion systems. which are way cool, but $$$!
Burning Brakes
Joined: Jun 2015
Posts: 1,192
Likes: 319
From: Shelbyville Kentucky
Thread Starter
Heel & Toe
Joined: Sep 2021
Posts: 19
Likes: 5
Thks for the info, always do the easiest remedy first, have plugs on order. Do you think heat will affect the rubber?
Talked directly to Billy he is sending me set of perforated cone inserts need to tacked in, see how plugs work first.
Talked directly to Billy he is sending me set of perforated cone inserts need to tacked in, see how plugs work first.
Advanced
Joined: Nov 2021
Posts: 67
Likes: 15
From: NC
Don't know your exhaust configuration so I don't know if that's an option but, 12 inch long, 2.5" glass packs solved drone problems on two other cars without restricting exhaust much. BTW, my favorite restaurant around Raleigh, NC is Casa Carbone. 
Team Owner
Joined: Sep 2001
Posts: 62,160
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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BB drones, not much new there. You can try installing cross piping, H or X, or plugging one outlet on each side on long trips.
Otherwise go Corsa.
Otherwise go Corsa.
Thread Starter
Heel & Toe
Joined: Sep 2021
Posts: 19
Likes: 5
Go to the local hardware store. Buy a pair of galvanized plumbers pipe plugs.to match the interior of the B@B pipe outlet. Install the plugs in the two INNER exhaust outlets. This should stop the drone. Also, stay away from an X pipe. The exhaust noise will drive your neighbors nuts.
Thks for great tip.