OEM exhaust modification idea.
- Thread starter fkong777
- Start date
I realize I cannot change the diameter of the pipes but It may be possible to give exhaust a better path.
By cuting open the #2 and #6 chamber. get to the pipe and cut away part of the exhaust pipes. Stuffing some of the piping with Steel wool to plug up some of the chamber. This will redirect flow of the exhaust to a open path.
Entire procedure can be very inexpensive if you have a power saw to open up the exhaust. Bring muffler to muffler shop to weld repair the opening
i really want to try this. Is there anyone in So Cal that has a decently low mileage OEM exhaust I can pickup for Cheap? or donate for experiement?
By cuting open the #2 and #6 chamber. get to the pipe and cut away part of the exhaust pipes. Stuffing some of the piping with Steel wool to plug up some of the chamber. This will redirect flow of the exhaust to a open path.
Entire procedure can be very inexpensive if you have a power saw to open up the exhaust. Bring muffler to muffler shop to weld repair the opening
i really want to try this. Is there anyone in So Cal that has a decently low mileage OEM exhaust I can pickup for Cheap? or donate for experiement?
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?
wouldn't it be cheaper just to run 2 n1 type canister exhaust to produce the same results.
dual N1 will cost 200-300 depending on the cost of the muffler you buy. IF you get Apexi or HKS brand canister it will run up to about $400-500
This in most part would be a DIY job. Prob best if the muffler is at the lower end in mileage. Mine was near 80K miles so it may not be a good candidate.
Maybe I'm optimistic about the cost but:
*Remove the muffler from car = Free DIY
*Cutting open muffler and cut off pipe = Free DIY if you have a power saw.
*Steel wool - Home depot paint dept. $5
*Repair the opening at muffler shop $50?
This in most part would be a DIY job. Prob best if the muffler is at the lower end in mileage. Mine was near 80K miles so it may not be a good candidate.
Maybe I'm optimistic about the cost but:
*Remove the muffler from car = Free DIY
*Cutting open muffler and cut off pipe = Free DIY if you have a power saw.
*Steel wool - Home depot paint dept. $5
*Repair the opening at muffler shop $50?
fkong777 said:
Treating the NSX like a beater, PRICELESS! :biggrin:
I think you are going to be rather disappointed at the lack of "restriction" that you find. Mufflers are pretty much hollow, so adding steel wool would <b>add</b> to any restriction issues.
However, if you got a spare muffler to learn on, then I recommend it. No point in dreaming if you do not follow up on it. The cost is cheap and you will learn a lot...maybe actually improve on things on this planet.
You will also need new exhaust gaskets ($4/ea...use civic ones same part, half the cost) and removing the bolts can be very challenging.
Drew
However, if you got a spare muffler to learn on, then I recommend it. No point in dreaming if you do not follow up on it. The cost is cheap and you will learn a lot...maybe actually improve on things on this planet.
You will also need new exhaust gaskets ($4/ea...use civic ones same part, half the cost) and removing the bolts can be very challenging.
Drew
I left my stock 91' exhaust in Kendall Ponds garage about 6 years ago when I bought Kendall's SRS exhaust.
I'm not sure if Kendall stil lurks on this forum, but if he does (Hello Kendall) and he still has my exhaust, you're welcome to it.
DaveG
I'm not sure if Kendall stil lurks on this forum, but if he does (Hello Kendall) and he still has my exhaust, you're welcome to it.
DaveG
fkong777 said:
Based on your diagram, the exhaust will be LOUD. You will need to either replace the straight portions of the pipes that you have coloured or drill zillions of small holes - which is not a good idea since the burrs from the drilled holes will cause airflow turbulence (but still better than stock anyday)
What is diameter of stock pipe? If you do not run FI, 2.25' is more than enough. Larger and you lose low end torque.
The steel wool added where you indicated will not increase restriction much compared to if it wasn't there but it would help in some sound absorbsion but not much.
The most restrictive part of the stock muffler is the purple mixing chamber. Cut that away would improve flow of stock alot without sound being too LOUD ie. leave the rest alone....it becomes a turbo muffler (like flowmaster) in effect...sorta.
Regardless of the negative opinions shared in this thread, I truly admire your time and investigation. It is always refreshing to hear interesting ideas!
Regardless of the mostly negative feedback you get, I say, go ahead, just do it.... And tell us how it goes....
fkong777 said:
It's made of steel, aluminum can not be used because it would melt. Oh and also you can not use steel wool it will burn up.
Briank said:
Actually many exhaust manufacturers use steel wool as the first absorbsion layer to protect the more delicate deeper layers of absorbsion material. For example, magnaflow uses steel wool wraped around the perforated pipe and then fill the rest of the chamber with mineral or rock wool. Mugen also uses a first layer of steel wool and then glass wool as the main absorbsion material after that.
It still burns off eventually but alot slower than the traditional glasspack
Why bother... the oem performs just as well as the comptech based on comptech's dyno numbers.
Like the intake, Honda really did their homework. It is tough for the tuners to do better without lossing drivability...
Like the intake, Honda really did their homework. It is tough for the tuners to do better without lossing drivability...
fkong777 said:
Doing all this to your Nsx sounds horrible. This is not a Crx or pos Civic thats driven by a kid that works at a local Burger King. Get a used muffler from someone thats an aftermarket piece for like $500 thats made for your car. That way its going to sound good, and its going to give you real performance instead of trying to rig your own muffler up.
fkong777 said:
It's steel. I just changed mine out for a custom exhaust and header. The OEM still looks good with no corrosion and the insides look ok as well - yes i like cutting things up to look inside....then i dumped it.
My suggestion if you want to modify the oem is per the diagram below, easy and effective. The original design is similar to the 993 and the famed RSR muffler mod for the 993 does nearly exactly what I am suggesting. It will not sound bad. It qont be quiet but it will be streetable unless you're in switzerland or california.
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my friends and i used to make mufflers for our dirtbikes all the time. one thing - steel wool burns.pzull said:
pzull said:
Willa, I didn't dispute that, but steel wool and mineral rock wool is a vast improvement over glass wool as absorbtive packing
