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Mufflers that are not as LOUD
Have any of you either changed the FFR supplied mufflers to something that is a bit quieter, added a resonator, or something else to reduce the sound.
At idle it sounds great, but under load or above 40 MPH it gets pretty loud. My wife is refusing to ride in it unless we don’t go over 30.
I’ve got an LS3 in it and no CAT’s, not required here.
Last edited by JimLev; 01-15-2023 at 10:16 PM.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
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I posted some info a couple of years ago here: https://thefactoryfiveforum.com/show...hlight=muffler
AFAIK, Magna-Flow or Borla are still the way to go for more rumble and less bark...
Keith HR #894
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PLATNUM Supporting Member
A pair of turbo mufflers really was much quieter for my wife's 33. See post#173
https://thefactoryfiveforum.com/show...allace18/page5
16+ FFR kits and counting!
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OK, thanks for the recommendations, I will check them out.
If anyone has more let me know.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
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Gee, leaving the original mufflers was my solution to get some time away from my wife!
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Post Thanks / Like - 0 Thanks, 1 Likes
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Originally Posted by
cob427sc
Gee, leaving the original mufflers was my solution to get some time away from my wife!
Sometimes that’s a good option.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
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Senior Member
The original mufflers worked like a champ to keep my wife out of the car. She said while we were driving it's too loud... I said What..... She rode in it one time. Win Win !!!!!
FFR 9883 MKIV ,427 Windsor engine
TKX 5 speed, Three Link 3.55 gears
Power Steering, Leather Seats
18" Wheels and Tires, Drop Trunk
Fun Package
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Senior Member
It's odd, I did not do the hard top and I think the FFR mufflers sound great. My wife is a huge car nut and loves the tone of the exhaust / mufflers. She jumps in for cruising every opportunity she get.
Jim
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Senior Member
Check out Car chemistry website or Summit Racing for cc inserts. Cc inserts go in the end of the side pipes tightly and are held in with a single rivet but do a decent job reducing the brassy noise. They come with caps that can be welded on to help more. You can also get stainless steel packing to place between the plates. I have a picture of mine as I had an issue with them sending me 2 different types. They corrected the issue within 2 days. Great service. They have other options that could fit your setup. Good luck…. 000C1D72-11D3-4305-987A-9DEB382AA12E.jpg
Last edited by brewha; 01-18-2023 at 08:32 AM.
Mark4 - 331 Stroker - Fitech 600 -TKO600 - Moser 3.55
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I’ll check them out. Maybe I can slide them into the muffler.
To me is seems the car was quieter when I was just driving it around in go-kart mode.
I’m limited to the length if I replace the muffler.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
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I ended up buying Borla ProXS mufflers and some Vibrant resonators. Both are straight thru perforated design with acoustical fiber.
It should help a little bit. Not plug and play, more like cut and weld to install them.
A2ABCF1C-2B28-4C48-AEF6-06A70320458A.jpeg
512E07F0-5FC5-4B05-93E7-3F102739DC9E.jpeg
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
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I have a closed car as well and the FFR’s are pretty loud.
I installed IMG_1378.jpg and they are quiet. Maybe too quiet, but good for now. I can swap if I want.
- Peterh226 #1134
'33 Hot Rod 2nd Gen. Blueprint 383 Sniper TKO Delivered 4/14/2019
Full Fenders, Top, 3-Link, Wilwoods
YOKOHAMA ADVAN NEOVA AD08 R | Fr 245/45 R17 | Rr 295/30 R18
AR605 Torq-Thrust M Chrome | Fr 17x8 | Rr 18x10
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Post Thanks / Like - 0 Thanks, 1 Likes
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Originally Posted by
peterh226
I have a closed car as well and the FFR’s are pretty loud.
I installed
IMG_1378.jpg and they are quiet. Maybe too quiet, but good for now. I can swap if I want.
Got a sound clip?
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Not yet. I'll get some once I complete assembly. Also, I'll check with my dbA meter.
- Peterh226 #1134
'33 Hot Rod 2nd Gen. Blueprint 383 Sniper TKO Delivered 4/14/2019
Full Fenders, Top, 3-Link, Wilwoods
YOKOHAMA ADVAN NEOVA AD08 R | Fr 245/45 R17 | Rr 295/30 R18
AR605 Torq-Thrust M Chrome | Fr 17x8 | Rr 18x10
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So I'm done with stage one and waiting to order two. Have 306 installed and was looking at going ahead and running exhaust to get it done and be able to go cart at quieter levels..............what do you all think about 14" glass packs out the back?
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Moderator
Originally Posted by
nhoth2o
So I'm done with stage one and waiting to order two. Have 306 installed and was looking at going ahead and running exhaust to get it done and be able to go cart at quieter levels..............what do you all think about 14" glass packs out the back?
In case you haven’t seen my recent posts: https://thefactoryfiveforum.com/show...l=1#post531352
James
FFR33 #997 (Gen1 chassis, Gen2 body), license plate DRIVE IT says it all!
build thread
My build: 350SBC, TKO600, hardtop, no fenders/hood, 32 grill, 3 link, sway bars, 355/30r19
Previous cars: GTD40, Cobra, tubeframe 55 Chevy, 66 Nova, 56 F100
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I doubt if 14 in glass packs will be considered quiet but I believe they will have a big impact on the level of heat transmitted to the floors. I used old school Porter mufflers on my car which are essentially another variation of the typical glass pack and they are positioned lengthwise right next to the outer frame rails. I don't have any of the heat problems in the floor that so many complain about...and I drive my car barefoot so believe me I can feel it.
I used that DEI "floor and tunnel shield" on the bottom of the floors. On the interior I added those closed cell neoprene adhesive pads (off Amazon) to cover the floor and on top of that added that foil lined bubble wrap type stuff meant for attics that I got from Lowes. Then laid the carpet on top. My floors get slightly warm but no where near as hot as so many guys complain about.
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Senior Member
I put 2 sets of car chemistry 3 row inserts into my 289, the sound is very reasonable now.
10 years after my roadster build....
289 FIA (pickup 28/08/20 if covid permits)
currently building a 289 and accumulating parts needed to finish a Canadian Kit.
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Originally Posted by
peterh226
Not yet. I'll get some once I complete assembly. Also, I'll check with my dbA meter.
Apple Watch reports 85Db at about 50mph cruise with windows down. Easy to talk, but no luxury car! Noise level is fine for my expectations and much better than the original load ones.
- Peterh226 #1134
'33 Hot Rod 2nd Gen. Blueprint 383 Sniper TKO Delivered 4/14/2019
Full Fenders, Top, 3-Link, Wilwoods
YOKOHAMA ADVAN NEOVA AD08 R | Fr 245/45 R17 | Rr 295/30 R18
AR605 Torq-Thrust M Chrome | Fr 17x8 | Rr 18x10
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Post Thanks / Like - 0 Thanks, 3 Likes
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I just put some Flow FX mufflers on. Basically cut off the FF ball joint and tips and had them welded to the mufflers. Sounds slightly less loud based on just my ears, but sound is deeper and way better. Biggest bonus is heat transfer to cabin is reduced a huge amount!IMG_1624.png
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I just finished taking off both FFR mufflers today. As James (RoadRacer) pointed out there is 0 sound deadline material inside them. Just 3 baffles with (1 big hole in each of them) that extends across the full width of the muffler.
Post 702 here. https://thefactoryfiveforum.com/show...l=1#post531352
Mine weren’t broken off like his were.
Last edited by JimLev; 08-14-2023 at 06:29 PM.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
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Post Thanks / Like - 0 Thanks, 1 Likes
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Got the Borla’s temporally installed.
Post 565.
https://thefactoryfiveforum.com/show...s-Build/page15
Yesterday I welded the ball/socket connections to the Borla mufflers. I’m waiting for UPS to show up (today?) with the insulation to cover them so I can install them. I ordered the insulation from Summit on Tuesday with 2 day shipping.
BEFFBF95-C925-484B-8112-43AF36AA34CE.jpeg
5769CA1A-8544-4BB1-A56D-6AE4058A5C89.jpeg
Last edited by JimLev; 08-18-2023 at 09:52 AM.
Reason: Added more info
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
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Got the Borla’s insulated and installed.
They are a little quieter than the FFR mufflers at idle, they have a bit lower rumble sound.
When I boot it it’s still loud but driving at 60 MPH the engine is in only at 1900 RPM and it’s noticeable quieter.
I still need to adjust the windows so they will seal to the top of the opening, that should help some.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.