OEM Muffler Mod????

[gtpvette]

Originally Posted by ort895

Apparently they don't really work that well

Based on the reviews I think you're right. What the hell,,,, I have $3 left in the budget,, I'll try one of the cheaper ones just to see.






Update,,,, the CDC did testing on these apps,,,,, who am I to question the CDC


http://blogs.cdc.gov/niosh-science-b...09/sound-apps/


they said this one was pretty accurate


https://itunes.apple.com/us/app/spln...355396114?mt=8


$3.99,,,, there goes the budget.

[turbocat]

Originally Posted by gtpvette

TURBOCAT,,, nice work on the refit. That's just a flow through with perforated tube and some type of sound suppressor I guess?? Makes me think I should cover all the holes in the baffles on mine. I picked up a small lightweight steel plate at Home Depot last night for $10 that will make the baffle covers. I'll try to cut it to fit tonight. I'm $47 into this at this point. $3 more and I'm over budget

Yeah, I think I was after better sound and lighter than stock axel back. I've achieved both. Good luck with your mod. Its fun to tinker and have success at it.

[gtpvette]

OK,,, did a bit of playing around with the IPhone DB meter on my wife's phone, certainly seems to work based on my WROOM WROOM noises. I should be able to show a difference between the two,, that is stock versus my modified muffler but in the end it'll be hard to tell. The fact is you'll need to base the sound level on all the mufflers to really get an idea. I also cut the plates to cover all of the holes in the OEM baffles. The question is do I cover all of the holes,, that is both sides or not. If I cover both sides,,, does it become a muffler delete?? I mean the sound waves will be bouncing around a bit but will it be too much??? I should have it done and welded up this weekend,, after building the fence so we'll see.....

[Dontales]

[ame]https://m.youtube.com/watch?v=-gbVYXPZDzA[/ame]
[ame]https://m.youtube.com/watch?v=vPScUht0Se4[/ame]
[ame]https://m.youtube.com/watch?v=M13QdYwcKFE[/ame]

Sounds perfect!

[gtpvette]

Sounds pretty good! What did you do to the internals???

[Dontales]

My friend did it, cut open the muffle at the OEM welding points, remove the perforated pipes inside and replace them with an straight Y-pipe, weld back again, just that.

[ort895]

Originally Posted by Dontales

My friend did it, cut open the muffle at the OEM welding points, remove the perforated pipes inside and replace them with an straight Y-pipe, weld back again, just that.

Doesn't sound too hard haha

[ort895]

Originally Posted by gtpvette

Sounds pretty good! What did you do to the internals???

Any progress?

[Dontales]

yeah, the fun thing is, in Switzerland the maximum allowed noise level for this car is 79db(A), measuered 0.5m from the exhaust in an 45 degree angle at 50% if max RPM (in this case 3750rpm) on a wamed up car/exhaust

my mod reaches only 78 by measuring it like above...however accelerating and decelerating change it to 103db

[FRSBRZGT86FAN]

Originally Posted by Dontales

yeah, the fun thing is, in Switzerland the maximum allowed noise level for this car is 79db(A), measuered 0.5m from the exhaust in an 45 degree angle at 50% if max RPM (in this case 3750rpm) on a wamed up car/exhaust

my mod reaches only 78 by measuring it like above...however accelerating and decelerating change it to 103db

It sounds quite good, makes me wonder why it wasn't done from the factory. I'm assuming it's because in a majority of places where the car may be sold the decibel rating may be even lower

[gtpvette]

Originally Posted by ort895

Any progress?

I welded in the plates covering the holes in the baffles. Plates may be too strong a word for 22 gauge metal as I kept burning holes through it. If there was a next time I'd use something thicker as it sure make it easier. I ended up covering most on the one side and half of the other. Hope it's not too loud,, don't really want that. The fence post caps are supposed to be here today, if so I'll try to get those in and weld it up by tomorrow.

[ort895]

I might start opening mine up today now that i have my header all tuned and squared away

[gtpvette]

Originally Posted by ort895

I might start opening mine up today now that i have my header all tuned and squared away

Any plan as to what you're going to do to the internals??

[ort895]

Originally Posted by gtpvette

Any plan as to what you're going to do to the internals??

I want to gut it all out and like stated above just kind of do some perforated piping that splits into a y for the exits.