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Quiet Muffler with good flow

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PhatEclipseGST

15+ Year Contributor
44
0
Mar 15, 2005
ADAMS, Massachusetts
The Laws in Massachusetts suck and I already got my registration revoked for a loud exhaust... So I am looking for a quiet muffler without losing much performance for a 1996 Eclipse GST
 
Try a Thermal exhaust system. They are fairly quiet.
 
screwdgie said:
Just get a resonator welded into your exhaust, that's what I am going to do.
Maybe 2 resonators. Do you have a catalytic converter? Those help quiet it down more too. And who doesn't like saving the environment... :p

My RNR is a tad loud, so I made a few changes to my driving habits. I use the gears more (less of that "straining" roar from the engine in the low RPMs) and I don't leave in gear when i'm coming to a stop at night. We'll see how long I last.
 
go to a muffler shop. they should be able order you these magnaflow mufflers that look like a stock muffler, but they have a 3'' inlet and outlet''. cost $65 for mine. it sounds really nice at high rpms. almost 350zish, but not quite... it is a straight path that looks like this:
 

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larsrya8 said:
Try a Thermal exhaust system. They are fairly quiet.


I have the thermal and it is loud as hell.

Your best bet would be an apexi n1. They are supposed to be in the legal DB range.
 
Alot of exhausts are in legal db limit. Depending on your area you will still get pulled over for having and aftermarket exhaust period. I would try a silencer or the resanator method, first since getting a new exhaust will cost much more.
 
I have a Tenzo R muffler on a custom exhaust with only a high flow cat, and its no loud at all, its almost hard to tell if the cars running sound wise when your in my car at idle.
 
Magnaflow 3 chamber or flowmaster 70 series. You can get a magnaflow with 3" inlet and dual 2.25" outlet. Looks bone stock and sounds smooth. Cop pulled my buddy over for a tag light being out and then tried to tell me twice that his exhaust was illegal. Both times I looked him right in the eye without hesitance and told him it was bone stock, though it was totally illegal but he was running the 14" magnaflow. Cop replied, "Yeah, you're right" and left feeling stupid. Another friend runs the 18" magnaflow with 3" O2 back and it sounds 100% OEM. I just fabbed up my brother's 3" O2 back exhaust today running the 3" inlet/ dual 2.5" outlet 14" magnaflow because he's been hassled by cops lately while running an Apexi N1 muffler. I gaurantee the magnaflow to fool them everytime, especially if you stick to your guns.
 
I've got the Magnaflow that is 18" long and has dual 3" outlets with an 18" Summit glasspack before it and it's loud. Wasn't bad when new but the packing has settled and now it's way too loud. I will have to add either a Random Tech nology cat or another typr of muffler/resonator in the system. There just isn't a good flowng muffler that is quiet. I even considered dual exhaust. mark
 
Eclipsei95cl said:
I have the thermal and it is loud as hell.

Your best bet would be an apexi n1. They are supposed to be in the legal DB range.


On the contrary, the Thermals for the gst's seem to be louder then the gsx's. I was expecting mine to be loud but its not at all. A friend of mine with a spyder gst is louder then mine and we have roughly the same setup.:rocks:
 
Eclipsei95cl said:
I have the thermal and it is loud as hell.

Your best bet would be an apexi n1. They are supposed to be in the legal DB range.

My Thermal is pretty loud to. I don't know if you have heard of Ractive but I have a friend with a TSI and he put the ractive muffler on his 3" turboback and it sounds like a freaking jet. There is no exhaust noise at all.
 
I don't realy think that made sense ^^. If it sounds like a jet, how can it be quiet. When i think of jets, i think almost eardrum blowing sound. Espically on takeoff.

Baffled mufflers, or cats, with stock looking tips. Thats about the only option.
 
The dual tip method works, I'll be one to talk since I live in socal. I run the dual tips from rre and a magnaflow strait through muffler with a 12" resonator from rre and I'm actually thinking about taking out the resonator because its too quite. I've been in front of numerous chp's and city cops and never been pulled over for sound of exhaust. I run no cat and it is qqqqqquiet. So anyway I'm changing mine out for an ebay strait through muffler and no resonator and a bored out cat cause I'm sick of it being quite. Plus I just registered my car in NY so no more cali police bothering me about smog and ref and shit.
 
Why are you going to go from running no cat to running a hollowed out or "bored out" cat? That will mess with flow quite a bit. Just leave the cat off, or take the shell of the old one and wrap it around your new pipe if you're worried about a no-cat fine.
 
staticbrainwash said:
Why are you going to go from running no cat to running a hollowed out or "bored out" cat? That will mess with flow quite a bit. Just leave the cat off, or take the shell of the old one and wrap it around your new pipe if you're worried about a no-cat fine.

At the velocity that the exhaust gasses are moving why the hell would it affect flow, maybe I should have mentioned its a 3" cat. But other than that you dont make any sense.
 
HAHA, how do i not make sense? Regardless of how fast something is moving, going from 3" into a hollowed cat (which will be much larger than 3") back to your exhaust will create rediculous turbulance. Seriously, read some threads on hollowed cats before you tell me i don't make sense.

If you want to run a cat, and have it flow get a randomtechnology cat. More flow, with real cat abilities, or get some other kind of high flow cat. Or don't run a cat at all.

Honestly for the cost of just getting a test pipe put in, don't hollow a cat. Espically if you're not worried about sound.
 
Personally, I think my N1 is more quiet than most other exhausts i've heard. That includes Greddy Evo, and Thermal, which are both usually considered to be pretty quiet exhausts. If I put the silencer in, it sounds pretty close to stock. (of course, that's no fun)
 
staticbrainwash said:
HAHA, how do i not make sense? Regardless of how fast something is moving, going from 3" into a hollowed cat (which will be much larger than 3") back to your exhaust will create rediculous turbulance. Seriously, read some threads on hollowed cats before you tell me i don't make sense.

If you want to run a cat, and have it flow get a randomtechnology cat. More flow, with real cat abilities, or get some other kind of high flow cat. Or don't run a cat at all.

Honestly for the cost of just getting a test pipe put in, don't hollow a cat. Espically if you're not worried about sound.


looked into it I guess your right it causes turbulence
 
gSx_r1der said:
The dual tip method works, I'll be one to talk since I live in socal. I run the dual tips from rre and a magnaflow strait through muffler with a 12" resonator from rre and I'm actually thinking about taking out the resonator because its too quite. I've been in front of numerous chp's and city cops and never been pulled over for sound of exhaust. I run no cat and it is qqqqqquiet. So anyway I'm changing mine out for an ebay strait through muffler and no resonator and a bored out cat cause I'm sick of it being quite. Plus I just registered my car in NY so no more cali police bothering me about smog and ref and shit.

Isd the RRE resonator the straight through type or does it have louvers? I am looking for something to quiet my nsystem as the Magnaflow had settled it's packing now after a yer and is quite noisy compared to last summer and I also have an 18" Summit straight thru glasspack ahead of the Magnaflow. Thanks, mark
 
Most cops don't care if its quiet or not. When i got two tickets at different times the first ticket was marked as Loud/Altered Muffler, the second ticket only said Altered Muffler. Kinda retarted that its illegal to not have a stock exhaust WTF
Honestly anyone should be able to do their own exhaust the way they want. The 350's, infinity's along with the new corvette's are much louder than my car is with an altered exhaust. It's totally not fair that i'll get a ticket for having a loud exhaust when those cars blow past me producting 2x the loudness
 
sweet97 said:
Isd the RRE resonator the straight through type or does it have louvers? I am looking for something to quiet my nsystem as the Magnaflow had settled it's packing now after a yer and is quite noisy compared to last summer and I also have an 18" Summit straight thru glasspack ahead of the Magnaflow. Thanks, mark

Yea it has the louvers, in it . Some say its a restriction but unless your pushing boat loads of power I dont see it killing horses at all.



92DSMErdrick said:
Most cops don't care if its quiet or not. When i got two tickets at different times the first ticket was marked as Loud/Altered Muffler, the second ticket only said Altered Muffler. Kinda retarted that its illegal to not have a stock exhaust WTF
Honestly anyone should be able to do their own exhaust the way they want. The 350's, infinity's along with the new corvette's are much louder than my car is with an altered exhaust. It's totally not fair that i'll get a ticket for having a loud exhaust when those cars blow past me producting 2x the loudness

Then vote you schmuck. Thats why these stupid laws get passed cause dumb ass kids like yourself are too busy on these forums and not in the news and politics making sure dumb asses dont get elected. :toobad:
 
gSx_r1der said:
Then vote you schmuck. Thats why these stupid laws get passed cause dumb ass kids like yourself are too busy on these forums and not in the news and politics making sure dumb asses dont get elected. :toobad:


YES!!! Very good point!:thumb:
 
I have the 3" inlet to the dual 2.25" outlet Magnaflow muffler. 3" Cat, Megan Downpipe and 3" RNR exhaust. I was yelled at by the police in Illinois, while I visiting for a day, about my exhaust, plus I had a leak because the RNR exhaust has a 3" flange and the Megan Downpipe neck downs to 2.5" at the exit. The 3" Cat was bolted directly to the 2.5" outlet on the downpipe and the RNR bolted to the Cat (this was a good seal).

And it was a really loud setup. I could literally hear it in my house basement from the garage. And you could feel the percussion of the exhaust on your chest (most likely from the exhaust leak). What I did to fix this problem was to order a 3" flange from RRE and two resonators a 3"x 12" and a 3" x 18" also from RRE. I took it took a reputable shop (I cannot weld) and had them cut the Downpipe at the hanger. And install the resonators and reflange it all. The mechanic decided to weld the 12" resonator infront of the Cat and after the hangers. He welded the 3" flange onto the end of the 12" resonator. Bolted the cat to the 12" Resonator. Then put the 3" RNR exhaust with flange against the Cat (this includes the O2 sensor). He then in the straight pipe to the muffler put the 18" resonator. The O2 sensor was stretched, but it fits.

The sound it makes is very nice. I noticed (probably just mentally) a slight decrease in performance from what I had before. But the exhaust is considerably quieter. You cannot hear it in the house anymore. At idle it just has a slight rumble and at WOT the noise is quite tollerable. Though ofcourse it is louder than stock. But I would think without a doubt it would pass the 50ft, 80dB at WOT law of California.

Other than the Illinois cop, I haven't had any police complain about my exhaust. I've been a prime target for window tint nazi's (in Iowa you can only have 75% tint). Not once have they mentioned the exhaust. But if anyone cares, I made it legal after spending a small fortune in fines... I fought the law and law one.. :tune:

But thats my two cents.
 
Yeah I am thinking about welding a resonator in there... I have a baffle in there but that is still to loud... And there is 1 asshole state trooper that gives u shit about your exhaust and not only fines you but screws you with the registry...


So I need to figure out suttin...



I got

• Ported Exhaust Manifold

• Custom 2.5" Down Pipe and Mid Pipe,

• Borla High Flow Cat

• AC Revolution Carbon Fiber Muffler
 
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