i recently bought a magnaflow rear section for my 02 MCS. i did not buy the resenator so the rear section is mated to the stock mid pipe. I think it sounds great but because i live at home, i have been told that it has to be a little quieter. i need to make it noticibly quieter at idle, what would be the best way to do that?? thanks

 

You need to add a resonator at the end of the center tube just before the Y.

Longboard

 

how much will adding a resenator do for the sound and idle? thanks

 

It depends on the length. Should do the trick for what you want.

Do you start it and let it warm up before leaving? My parents hated me for that because I had a sport bike with race pipes.

Longboard

 

Dont go cheap on the resonator. I would look at the flowmaster hushpuppy or whatever its called resonator. I think Misfitoy has/ had one on his you might wanna pm about it

 

hushpuppy

Hushpower.

 

hahaha i was close

 

If you live in the Bay Area I have a JCW resonator,free! All you have to do is pick it up.

 

When I had a Magnaflow I added a second 36" resonator just before the "T".

That finally made it bearable for long trips.

How I long for those sort of quiet days.

Bill

 

I recently replaced a traditional resonator (the baffle was loose and rattling) with a moroso spiralmax muffler. 2.5 in/out with a 4 inch OD body. This change made the car alot quieter. The idle is good, cruise is very quiet, and full throttle opens up. Another option to make your decision more difficult.

 

I'd simply park two blocks away from my parents house.

 

I took the simplest option and sold it

Absolutley hated the Magnaflow, way way too loud for me.

 

try a 1-ball

 

i love the sound, im 18 and loud is still good for now. i just need it to be quiet enough at idle for my parrents not to fliip out again. has anyone packed a resenator with anything?

 

I personally wouldn't recommend packing your own resonator. You'd be better off buying a quality resonator. It'd be cheaper in the long run.

 

is moving out an option?

 

i leave in august for college and the car comes with me but until then, their house, their rules. looks like a good resenator is the best option. any suggestions on the best at a reasoable price? thanks

 

http://www.aeroexhaust.com/performan...ator_ar20.html

 

some more:
http://www.verociousmotorsports.com/...ory/Resonators

abd a few more:
http://www.sfxperformance.com/catalo...ors/page_1.htm

 

First, what is the diameter of pipe after the header/cat? That will determine the inlet and outlet diameter. A 2 inch ID core (like the later model stock Magnaflow) will be effective but will also cause power robbing drag. Longer is better than short but there is only 20 inches between the forward flange and the middle hangers. An 18 inch long 4 inch round diameter will fit, but it is tight; a resonator body greater than 5.5 inches in diameter (14 inch length) will not have enough room above or on the sides to avoid contact with the heat shield. As mentioned earlier the 12 inch long Spiral Flow is effective and will fit in the available space post-cat, it is 2.5 inch inlet & outlet. Also, a 5 inch round body, 14 inch long Magnaflow is another good choice.

For the space behind the middle bracket, unless a custom bend is made, 3.5 inch diameter (round body) is about the limit of what will fit in the rear channel. A work around would be to use a long Hushpower and spread the heat shield but once again without going custom bends there might be contact. If you go custom bends, a larger diameter can be used but the risk of scrapping speed bumps is greater.

 

i want to mount after the middle bracket as the pipe has already been cut there. i have no problem widening the heat shield to incorperate a 4.5-5inch diamerter resenator and have herd good things about the ultra quiet and the hushpower but cant find the hushpower for sale..... any idea how long the pipe is between the middle bracket and the split in the magnaflow exhaust? thanks

 

The reason I said the heat shield could be widened was for the Hushpower which is wider on the transverse plane. There is a limit to how wide it can spread and the roof can not be extended, so depending on the bends, a 4 inch round might not have enough room. Keep in mind the Magnalfow is already limited in how far the tips can be tilted upwards so if you try to dip the Y-pipe downwards it will cause harder contact with tips against the rear trim piece.

In this photo I have a 3.5 inch diameter resonator body on 2.25 OD pipe, there is only about 3/8ths clearance above it.

 

ok, does the resenator in the picture have enough size to quiet the exhaust? that looks like a fine size for clearance. i have also done some youtube research and a hushpower 18inch does the trick but i cant seem to find one, any ideas?

 

Someone asked this exact same question before. If you have a stock length header, the most sound attenuation will be from a large 6" diameter, 14" long muffler right after the cat before the hangers, where there is room for something this wide.

The reason for this is because reduction in amplitude is largely from the diameter (expansion ratio), while length mostly affects the frequency where maximum attenuation occurs. That's the reason short catalytic converters are so effective at reducing volume (plus if they are large enough, they can even make fine "termination boxes"). The main reason it's so hard to quiet a 3" exhaust is because there's just not enough room to make the cans relatively large enough to make it quiet--while a stock 3" exhaust on a huge truck isn't necessarily loud... because there is room there.

Quiet requires either big cans or high backpressure. If you want to filter out unpleasant high frequencies while keeping a loud low rumble, you want fat, short cans.

 

that pervious thred was a huge help. one question about the magnaflow 6" diamater resenator. did you mount it after the cat and before the center hanger? thanks