Metal Substrate Cat vs Resonator for Noise Suppression
#1
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Metal Substrate Cat vs Resonator for Noise Suppression
hiya,
Wondering if ppl who have the metal substrate cats (like KS Metalit or Catco) noticed any significant noise reduction? They seem to flow really well but my sanctioning bodies have lowered the noise limit down to 95dBA (thanks to the nimby's).
So instead of just adding something like a Magnaflow resonator in the midpipe for noise suppression, I'd use the met sub cat to also get the benefit of less stink.
Any opinions and/or comments?
BTW, my search results mostly in the effectiveness of the metal substrate for emissions but haven't found answers for noise.
Thankeee.
Wondering if ppl who have the metal substrate cats (like KS Metalit or Catco) noticed any significant noise reduction? They seem to flow really well but my sanctioning bodies have lowered the noise limit down to 95dBA (thanks to the nimby's).
So instead of just adding something like a Magnaflow resonator in the midpipe for noise suppression, I'd use the met sub cat to also get the benefit of less stink.
Any opinions and/or comments?
BTW, my search results mostly in the effectiveness of the metal substrate for emissions but haven't found answers for noise.
Thankeee.
#2
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I used the Random Technologies cat in my car. Doesn't work well for decreasing sound levels. It does flow quite well overall though.
A few people like Max Cooper installed the metal substrate cat along with a Magnaflow in the midpipe. NewbernD (sp?) also.
A few people like Max Cooper installed the metal substrate cat along with a Magnaflow in the midpipe. NewbernD (sp?) also.
#3
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I have both a Borla XR-1 and a stainless cat in my midpipe, and a racing beat dual. I was shooting for "barely meeting emissions", breathing as well as I could and quiet as I otherwise could. It's really not bad until the wastegate opens. It drones a touch but is definitely better than a straight midpipe.
Pics: http://dave.newbern.org/gallery/midpipe
Pics: http://dave.newbern.org/gallery/midpipe
#4
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Yep, like Max Cooper, I did a metal-subtrate CAT with a Magnflow muffler/resonator and an old TRUST SP rear muffler.
She's quiet and not too bad when you're on it. Roebling Road also has a 95 dbA restriction, and I'm definitely quieter than some of the other cars out there!
:-) neil
She's quiet and not too bad when you're on it. Roebling Road also has a 95 dbA restriction, and I'm definitely quieter than some of the other cars out there!
:-) neil
#5
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Another idea -
http://www.re-amemiya.co.jp/commodit...ac5c2&scd=5640
RE Amemiya in Japan makes a few "dolphin tail" mufflers. This basically points the exhaust tip down at the ground, which some times will reflect the noise away from the DB meters at a track. I know that's why they designed it. Just FYI .
Dale
http://www.re-amemiya.co.jp/commodit...ac5c2&scd=5640
RE Amemiya in Japan makes a few "dolphin tail" mufflers. This basically points the exhaust tip down at the ground, which some times will reflect the noise away from the DB meters at a track. I know that's why they designed it. Just FYI .
Dale
#7
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I also did a metal-subtrate CAT with a Magnflow muffler/resonator. It worked great. I had the Apexi N1 single cat back. It didn't stink and wasn't too loud. Just perfect IMO.
I have 2 movies on my web page. Niether is really an exhaust sound clip but the longer one has an inside the car clip half way through where I ran WOT from 40 to 140. It wasn't too loud at all.
www.heathmoore.net
I have 2 movies on my web page. Niether is really an exhaust sound clip but the longer one has an inside the car clip half way through where I ran WOT from 40 to 140. It wasn't too loud at all.
www.heathmoore.net
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#8
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thx for the replies!
btw, the met-sub cats don't require the airpump, right? guess i'll be doing a resonated metal substrate cat.
cheerios!
btw, the met-sub cats don't require the airpump, right? guess i'll be doing a resonated metal substrate cat.
cheerios!
#9
Eats, Sleeps, Dreams Rotary
Originally Posted by HedgeHog
thx for the replies!
btw, the met-sub cats don't require the airpump, right? guess i'll be doing a resonated metal substrate cat.
cheerios!
btw, the met-sub cats don't require the airpump, right? guess i'll be doing a resonated metal substrate cat.
cheerios!
the knightsport one has a hook up for it. I left mine attached to the airpump
#10
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Originally Posted by HedgeHog
thx for the replies!
btw, the met-sub cats don't require the airpump, right? guess i'll be doing a resonated metal substrate cat.
cheerios!
btw, the met-sub cats don't require the airpump, right? guess i'll be doing a resonated metal substrate cat.
cheerios!
Mine is hooked-up to the air-pump.
:-) neil
#13
Originally Posted by M104-AMG
Our rotaries run rich, so they need the airpump to help the cat do its work and not prematurely fail.
Mine is hooked-up to the air-pump.
:-) neil
Mine is hooked-up to the air-pump.
:-) neil
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The metallic-substrate cats do not need an airpump to survive, provided they are sized properly. However, you will not pass emissions in stricter states without the airpump hooked up.
In some driving conditions, I thought my hi-flow cat (Bonez) was louder than my resonated midpipe is (single Magnaflow).
In some driving conditions, I thought my hi-flow cat (Bonez) was louder than my resonated midpipe is (single Magnaflow).
#17
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Originally Posted by Mahjik
Not that I've seen for the FD. However, just go to a $20 muffler shop and they'll weld it all up for you for probably under $50.
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