Easiest way to quieten my exhaust
- Thread starter olly
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exhaust
When I went for my rego inspection the exhaust registered a 94dB reading so I threw a little pea shooter muffler on the end instead, took it back and just passed with 89dB. You should be right with just a muffler with a tiny pipe.
I should add it depends on how loud it is now!!!
When I went for my rego inspection the exhaust registered a 94dB reading so I threw a little pea shooter muffler on the end instead, took it back and just passed with 89dB. You should be right with just a muffler with a tiny pipe.
I should add it depends on how loud it is now!!!
GSRWRC
I am The Stigs fat cousin
Fit a couple of straight through resonators. Will quieten up things nicely.
steve said:Steel plate with a couple of small holes drilled in it bolted between your exhaust and muffler flange does wonders
they check for those....
what kind of muffler/exhaust is on there now Olly? can you make a pea shooter muffler to interchange with the rear exhaust section like i have?
GSR94T
Well-Known Member
i got done by EPA before for noise, so i took an old muffler to an exhaust place, and they welded on a pipe and flange (from memory looks about 1.5" in diameter but not sure) and it bolts on to the flange with the rest of the exhuast - bolts into the spot shown in GSRSOL's picture or thereabouts.... then i passed the test and put my cannon back on :wink:
doommachine
Well-Known Member
If you have 2.5 - 3" pipes, and a flanged exhaust, take an empty rexona can, pierce it, cut the spray part off, then put a few holes in the bottom section (say, 8). Fill with steel wool. Then make a couple of tabs to allow it to hold itself between the flanges of your exhaust. Try to put it as far away from the tailpipe as you can (post cat), that way if they shine a torch up your exhaust they can't tell.
Quietened my car down a lot, and I have (effectively) an XS power muffler.
Try not to drive too much like this, the amount of additional backpressure this causes is very noticeable. But, it is cheap and easy, so if it doesn't work well enough you're only out five bucks, plus you get to feel the same power output as a datsun 120y.
Quietened my car down a lot, and I have (effectively) an XS power muffler.
Try not to drive too much like this, the amount of additional backpressure this causes is very noticeable. But, it is cheap and easy, so if it doesn't work well enough you're only out five bucks, plus you get to feel the same power output as a datsun 120y.
ive had plenty of EPA tests, some testers are anal about "baffle plates" and some don't even bother looking under the car.
if you have a flange, replace the gasket with a thin piece of steel with a few little holes in it. that should quieten it down, but don't drive the car hard while it's in.
if you have a flange, replace the gasket with a thin piece of steel with a few little holes in it. that should quieten it down, but don't drive the car hard while it's in.
nah, just make a restrictor plate like Matt said. I do it all the time for mates exhausts when they go through Regency. As long as it is thin steel and slightly smaller than the flange gasket they will never know its there. Drill like 6 smallish holes in it and it quiets down a lot. My G/F's ET pulsar had 95db, after I put the plate in it went down to 84db. Just keep the boost low, dont plant it at all. Easy to make, install and remove.
GSRWRC
I am The Stigs fat cousin
WHY do people go to such drastic lengths to temporarily quieten an exhaust? A pair of 18" resonators will not harm performance and will quieten the exhaust dramatically. It wont sound boring like a stock exhaust, but it will make it legal and you wont have to worry about it at all again.
Get an XFORCE VAREX muffler and not get pulled over for noise in the first place, especially where you know you have a chance of being heard by the authorities (plus they will make the neighbours happy especially at night :wink: ). I bought two a couple of months ago for $399 each for my brother and I. View the video link here where they use it on a WRX and then close the butterfly :wink: : http://www.youtube.com/watch?v=K7jGYnhbQQU .
Overall the quality is very impressive with the only downfall being that Im not too sure how the car is gonna like it when the butterfly is closed as the escape holes look to be a couple of inches wide in diameter. Not that you'd be full throttle and getting up it with the butterfly closed though so it'll quieten the car when you need it to. They have a 10 year stainless warranty and a 12 month mechanicals warranty. They come with a hoop for installation and a exhaust gasket and flange ready to bolt onto a 3" exhaust.
Overall the quality is very impressive with the only downfall being that Im not too sure how the car is gonna like it when the butterfly is closed as the escape holes look to be a couple of inches wide in diameter. Not that you'd be full throttle and getting up it with the butterfly closed though so it'll quieten the car when you need it to. They have a 10 year stainless warranty and a 12 month mechanicals warranty. They come with a hoop for installation and a exhaust gasket and flange ready to bolt onto a 3" exhaust.
Its a bit like a duel blow off valve. If you drive with it in plumb-back mode on the street its 100% legal. If you set it to atmo venting its illegal. If you get pulled over and its in plumb-back they technically cant ping you for it as they would be modifying the car if they set it to atmo. Think of it as the fact that we have an accelerator, but we choose not to put our foot down to exceed the speed limit. I know the law is pretty grey and they do say that you are not supposed to be able to adjust any part of the vehicles emissions system from inside the car, but are we actually changing emissions with the butterfly?? I think not. It's just sound, and we choose NOT to change it on the street (should they pull us over and notice it anyway).
