Very quiet turbo exhaust - LFN sensitivity
07-21-2017, 12:06 PM
#81
Elite Member
iTrader: (2)
Join Date: Aug 2016
Location: New Fucking Jersey
Posts: 3,890
Total Cats: 143
I have a full FM setup from the manifold back. It's a 2.5 exhaust with a cat and muffler... It gets a bit loud and droney on the highway and is louder than I thought it would be.
Any advice to get it to quieten down a bit? I figured this was a good thread to ask in.
Any advice to get it to quieten down a bit? I figured this was a good thread to ask in.
Reply
0
0
07-21-2017, 12:38 PM
#82
Junior Member
Thread Starter
Join Date: Feb 2014
Location: Columbus, IN
Posts: 324
Total Cats: 37
Summary from this thread:
1) Magnaflow muffler is the quietest muffler. Replacing current muffler with magnaflow will probably fix the issue by itself. Not really much point in doing anything else until the offending non-compliant muffler issue has been remedied. EO2K's dual flow magnaflow is even quieter than the ones most people use. Part number is in this thread, I think page 2. Look for a ton of pictures.
2) If still too loud, adding the biggest resonator you can fit will also help.
3) If still too loud, adding 2 of the biggest resonators you can fit will further help.
4) Failing that, a spring loaded flapper valve will make a significant difference with very little pressure loss (pressure loss will depend on the spring constant, so if building one yourself, keep that in mind). Jason ripped one out of a dynomax VT that worked well. I think it would be easy to make one if you have any welding and machining skilz. Can also look into the Apexi exhaust control valve; 18PSI used one with good results.
5) 1/4 wave resonator will also help at specific frequencies with zero pressure loss. While effective, it might be tricky to fit one under a Miata, especially with 2 resonators and a big *** magnaflow.
1) Magnaflow muffler is the quietest muffler. Replacing current muffler with magnaflow will probably fix the issue by itself. Not really much point in doing anything else until the offending non-compliant muffler issue has been remedied. EO2K's dual flow magnaflow is even quieter than the ones most people use. Part number is in this thread, I think page 2. Look for a ton of pictures.
2) If still too loud, adding the biggest resonator you can fit will also help.
3) If still too loud, adding 2 of the biggest resonators you can fit will further help.
4) Failing that, a spring loaded flapper valve will make a significant difference with very little pressure loss (pressure loss will depend on the spring constant, so if building one yourself, keep that in mind). Jason ripped one out of a dynomax VT that worked well. I think it would be easy to make one if you have any welding and machining skilz. Can also look into the Apexi exhaust control valve; 18PSI used one with good results.
5) 1/4 wave resonator will also help at specific frequencies with zero pressure loss. While effective, it might be tricky to fit one under a Miata, especially with 2 resonators and a big *** magnaflow.
Reply
1
1
07-21-2017, 12:49 PM
#84
Junior Member
Thread Starter
Join Date: Feb 2014
Location: Columbus, IN
Posts: 324
Total Cats: 37
Haha, I'm glad you guys got it working!
Thanks for the data point; one thing I've learned from this investigation is that people's definition of "very quiet" varies wildly. I'm hoping the 2 ultra quiets and magnaflow will be good enough for me.
Thanks for the data point; one thing I've learned from this investigation is that people's definition of "very quiet" varies wildly. I'm hoping the 2 ultra quiets and magnaflow will be good enough for me.
Last edited by Engi-ninja; 07-21-2017 at 08:17 PM.
Reply
1
1
07-21-2017, 02:18 PM
#86
Elite Member
Join Date: Jul 2005
Posts: 6,420
Total Cats: 84
I have a full FM setup from the manifold back. It's a 2.5 exhaust with a cat and muffler... It gets a bit loud and droney on the highway and is louder than I thought it would be.
Any advice to get it to quieten down a bit? I figured this was a good thread to ask in.
Any advice to get it to quieten down a bit? I figured this was a good thread to ask in.
I suggest selling the muffler section and building a replacement with the big Magnaflow as a first step.
Reply
0
0
07-21-2017, 03:17 PM
#87
Elite Member
iTrader: (2)
Join Date: Aug 2016
Location: New Fucking Jersey
Posts: 3,890
Total Cats: 143
I have a cat as well, which should have quietened things down as well.
Thanks for the input.
Reply
0
0
07-21-2017, 08:28 PM
#88
Junior Member
Thread Starter
Join Date: Feb 2014
Location: Columbus, IN
Posts: 324
Total Cats: 37
The MKTurbo kit is very "quiet," but basically all it makes is "low frequency noise." If those added mufflers can dampen the low frequencies you will be golden.
Reply
0
0
09-20-2017, 02:11 PM
#89
Junior Member
Thread Starter
Join Date: Feb 2014
Location: Columbus, IN
Posts: 324
Total Cats: 37
Update: MK Turbo successfully fit 2 vibrant ultra-quiet resonators and the big magnaflow muffler. The result is the most nearly silent straight through 3" exhaust you've ever heard. Concealer404 says it's quieter than a stock MSM. Will work on posting a drive by at some point.
Reply
0
0
09-20-2017, 02:20 PM
#90
mkturbo.com
iTrader: (24)
Join Date: May 2006
Location: Charleston SC
Posts: 15,176
Total Cats: 1,680
Update: MK Turbo successfully fit 2 vibrant ultra-quiet resonators and the big magnaflow muffler. The result is the most nearly silent straight through 3" exhaust you've ever heard. Concealer404 says it's quieter than a stock MSM. Will work on posting a drive by at some point.
Adding 2 resonators is not something I am going to regularly do, they don't fit in my standard boxes.
Reply
0
0
09-27-2017, 07:51 PM
#100
I had a good one that i sent to @vteckiller2000 but i've deleted it since. Maybe he can easily come up with it? It was REALLY nice. Much impress.
Reply
0
0
