Mid-mount muffler setups-how's the drone?

Discussion in 'Mustang Chit Chat' started by ghunt81, Nov 28, 2017.

  1. 06 T-RED S/C GT

    06 T-RED S/C GT forum member

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    Are you running the Thrush 24" mid mounted glasspacks and O/R H as an axle back delete or also with axle back mufflers added ? From the video you posted, it appears you still have the Roush extreme mid mounts installed :shrug:
     
  2. sc517hp

    sc517hp Junior Member

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    Mine had a two in two out single chamber 8" long generic muffler for about 3 months. I replaced the h-pipe with it like a MAC ProChamber, and there were no clearance issues on my lowered S197 - in the end I never found axle backs that sounded the way I wanted with that setup so I went back to the x pipe. Now I'm back with an h pipe to get rid of that last little bit of raspy edge in the tone.
     
  3. sc517hp

    sc517hp Junior Member

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    I still have the axle back muffler deletes from the Roush mid kit, but mid mounts are Thrush.
     
  4. 07 Boss

    07 Boss forum member

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    The main problem with getting our exhaust to have that old school muscle car rumble is the location of the mufflers in relation to the tips. They are right on top of each other. When you mid mount mufflers/resonators it gives you a lot of distance to the tip. That is why our cars can get that raspy raw sounding exhaust. I suggest mid mounted to anyone who ever asks, "How do I get that old school rumble?" I thought I even seen someone mid mount staggered stingers and it sounded awesome.
     
  5. 06 T-RED S/C GT

    06 T-RED S/C GT forum member

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    I should've realized you swapped out the Roush mid mounted resonators in favor of your Thrush glasspacks while keeping the Roush delete tips.. My only concern with glasspacks is IIRC the packing material used will eventually burn up and may cause obstruction issues down the road.. Also from my understanding resonators/mid mounted mufflers will only dampen, reduce drone but don't cancel out the frequencies that produce drone.. What I like about the Solo performance design, is they use "resonance chambers" aka helmholtz resonator/J-pipes that not only reduce drone, but also cancel out the sound frequencies which produce drone altogether.. Best of all, they eliminate drone with the existing mufflers in the factory locations without the need for having to upgrade to a mid mounted exhaust setup.. Therefore I'm seriously considering the Solo performance system as a possible alternative option for that reason..

    Perhaps it's just me, but since adding the O/R pro chamber, I don't notice any rasp or raw sounding exhaust with the stingers in the factory locations.. My main concern is interior resonance drone and despite the fact that moving the location of the mufflers may reduce/dampen drone, it doesn't cancel out the sound frequencies that produce it.. From my understanding other than the Solo performance exhaust system I've mentioned in this thread, the Corsa performance exhaust and FR500S mufflers are the only others specifically designed and engineered to cancel out the sound frequencies for producing interior resonance drone.. Therefore my reasons as stated above is my purpose for considering the Solo performance option as a possible alternative..
     
  6. sc517hp

    sc517hp Junior Member

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    Totally agree that glasspacks are not the long lasting solution- never heard of them plugging up but I know for a fact they get louder with age as the packing wears out. Also, they are painted mild steel and will rust out before the packing wears out- the 93 octane 10% ethanol pump gas I use creates a ton of water as it burns. I'm sure there's a puddle just sitting in them every time I take a short drive that doesn't heat up the exhaust enough. No worries though, I have a solution- I'll just change my exhaust.... again....
     
  7. 06 T-RED S/C GT

    06 T-RED S/C GT forum member

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    I did manage to locate some Thrush 25" glasspacks in stainless steel from Summit Racing for $104.00 each.. Just a bit out of my price range, but perhaps you might be interested when the time comes to replace your current glasspacks.. Anyhow I went ahead and provided both a link and image..

    https://www.summitracing.com/parts/wlk-24240/overview/

    wlk-24240_it_xl.jpg
     
  8. sc517hp

    sc517hp Junior Member

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    Thanks for the info. I have researched SS glasspacks and came to the same conclusion- a bit pricey. Right now the ones I have are mounted with band clamps. I sawzall'ed 4 kerfs 2" deep on each side and clamped them to my SS exhaust pipes so the band clamps would cinch up. Don't see or hear any signs of exhaust leaks, and it allows me to adjust my axle back tip alignment better. When they wear out I'll just unclamp them and buy another pair for $22 a piece at my local autoparts store. I can change them three more times for the price of SS glasspacks :)
     
  9. 06 T-RED S/C GT

    06 T-RED S/C GT forum member

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    You're absolutely 100% spot on and couldn't agree more :cool:
     
  10. Pentalab

    Pentalab forum member

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    FRPP FRS-500 mufflers, no drone. Then added JBA ceramic coated LT's and mating JBA high flow catted H. Was way too loud and bad drone at 1900-2000 rpm. At 70 mph in OD, it's 2100 rpm with a 3.31 rear gear. Had SS M80's welded in, just before the rear axle. We cut the slotted portion off of each end of both M80's, prior to welding them 360 degs. Down to an acceptable sound level, and drone is 90% gone, but still a bit at 2 krpm. The sound is a lot deeper, lower pitched. Hold an empty large cardboard box by the tip of one flap, and the box vibrates. It's almost like it has a sub sonic component to it.. that can be heard inside the house, with car idling across the street.

    Buddy had cherry bombs, on the ends of his LT's. Burnt the red paint off, then burnt the insides out. Cherry bombs use alumininzed steel alloy. It's not the best material to use for a simple resonator. The SS resonator's, welded in, hold up well. The FRS-500 mufflers on my 2010 have tips that are 1" longer than the FRS-500's used on the 05-09 cars.
     
  11. 46addict

    46addict 13726548

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    Do you have any pics from when you had this set up? And are your glasspacks currently dumped?
     
  12. pebkac

    pebkac Junior Member

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    Burnout video

    Significance. How loud a that distance example only
    This setup was American racing 1 3/4 headers catted h pipe and SLP loud mouths. Very loud when accelerating hard. At 70mph it was virtually silent. No drone.

    Same setup as above coldish start.

    Same setup as above with the addition of the pypes mid muffler system. No drone.


    I am lowered 1inch. I have only have issues with ground rub in the most extreme of situations. Very steep drives and or steep overly tall speed bumps which I hit too fast.

    NO driveshaft rub either.
     
  13. 06 T-RED S/C GT

    06 T-RED S/C GT forum member

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    So if your FR500S mufflers didn't drone until after adding the JBA LT's and high flow catted H.. Which in your opinion is causing the drone, the JBA LT's, high flow catted H or both :shrug:
     
  14. sc517hp

    sc517hp Junior Member

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    I'm the worst when it comes to taking pics and documenting, but here's what I did: I took an offroad h-pipe I bought on Craigslist for $30 and cut the pipes before the H. It slipped right on my Magnaflow high flow cats. I loosened both pipes at the header flange (JBA shorties) and moved them until I could slip the 2in 2out single chamber muffler on. At that point I supported the setup and got it where I wanted for height and side to side, then tightened up the pipes at the header flanges and clamped the chambered muffler with normal u-bolts (planned to weld it up when it was fine tuned, but it is in my basement now with the u-bolts on it). BTW, none of my setups ever made it to getting welded. Mid pipes where my stock mids cut to length so they would slide in the muffler and have the correct length and angle for the axle backs. It had great tone with delete axle backs but WAY too loud and drone was awful. Like Flowmaster American Thunders on steroids. Tried several axle back mufflers with it, never got the tone just right.

    My glass packs are on the old Roush Extreme mid pipes after I cut off the original resonators. I basically replaced the originals with Thrush glaspacks- not dumped, but over the axle and with the Roush muffler deletes.

    ....I really need to quit screwing with my exhaust...
     
  15. AndrewNagle

    AndrewNagle forum member

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    Fixed it for you
     
  16. Pentalab

    Pentalab forum member

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    The research I did indicated the extra overall ( excess) loudness came from the high flow catted H..and not the JBA LT's. As far as the drone, my guess is the combo of the LT's + high flow catted H.

    The FRS-500S are guaranteed drone free.... provided the rest of the exhaust is oem.
     
  17. Bingo

    Bingo Because street car

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    Ehhhh. I get a little bit, but only at very specific RPMs and under load. It rarely happens, so it's a nonissue, but it still occurs.
     
  18. Pentalab

    Pentalab forum member

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    If you do get some drone, it might be at 1900-2100 rpm, and going up an incline, hill, or steep hill. That would really put a good load on the eng. It's a good muffler, albeit expensive.
     
  19. 46addict

    46addict 13726548

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    Changing midpipes can greatly affect tone and volume so I would think most of the drone is coming from the high flow H pipe.

    This is one of the better sounding setups. Made me think about switching to an H.
     
  20. Pentalab

    Pentalab forum member

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    My problem with an X is... they typ sound too raspy. The H sounds better imo, and slightly more tq down low. The X provides more tq / hp at the upper end. Use whatever combo you want, but you have to live with it. One thing tooling around town, or on the hwy for short trips. But on a longer trip, the exhaust can sound tedious. Folks will typ speed up..or slow down a bit, to keep the rpm out of the drone.... 'rpm window'.
     

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