psing23

did anyone try to make like a dual exhaust on there max but i mean 2 mufflers... what are your opinions on that? i was interested... i have a friend that owns a meinekee so he would be able to do it for me... but other than looks how much performance do you think i will achieve with that?
thanks
-danny

blackmax2000

I talked to Stillen about dual exhaust. They said too much backpressure and would harm performance.

y2kse

iTrader: (1)

I don't think you'd add much backpressure by setting up a dual exhaust, particularly if you removed the existing backpressure by installing straight-through mufflers and mandrel-bent piping from the cat back. But I doubt you'd gain any performance over a single straight-through muffler. Dual exhausts would look pretty cool, though.

I think I remember that someone here actually put a dual exhaust system on their Maxima. But I can't remember who it was.

Y2KevSE

iTrader: (13)

The New CLIMAX did in his previous life... he might still have pics of his 4th gen.

blackmax2000

sorry guys left out a word...stillen said duals would decrease backpressure..sorry

psing23

is that good or bad?

blackmax2000

well the way they put it, with single high performance exhaust there is a perfect amount of backpressure. By adding the second pipe there is now twice as much volume for the air to pass through, so therefore much less pressure. They said it would look cool, but would harm performance. The way I look at it, if the skyline can live with singles, I can too.

Black VQ

If the Max already has the 'perfect' amount of backpressure, lowering further would reduce power the same as increasing it would. If you want the looks, go for it. But you also have to think of the extra weight involved too.

psing23

but when put an aftermarket muffler doesnt it also free up exhaust flow? it just lets out more air... how does backpressure work? and what does it do? like how does it add or take away power? i just see it as letting out more air which helps in the breathing process... but i am not looking at it in the enginnering way (dont have experience or too much knowledge about that) but just in a way of logic... please explain
thanks

y2kse

iTrader: (1)

It strikes me that removing piping is the way to reduce backpressure. Assuming everything else is equal (i.e., pipe diameter, number and type of bends, muffler construction, etc.) would adding more piping and more outlets actually reduce backpressure? If so, would the amount of backpressure reduction be all that significant?

Also, I was under the impression that reducing backpressure helps high-rpm performance at the expense of low-rpm performance. Was I wrong about that?

[Edited by y2kse on 11-29-2000 at 02:24 PM]

blackmax2000

I really have no idea...just quoting what they told me.
Basically they said that they originally tried a dual system as their system of choice, but ended up losing 5-10 hp across the rpm range.
The whole backpressure thing is a mystery to me as well. I called a couple of different people at stillen and they all said the same thing.

I will tell you this, the system I asked them about would be a "true dual" system(one pipe from each manifold, with a cat on each pipe). It might be okay to have one pipe from the manifold to the cat and have a Y split from there back. Don't really know.

Hope this doesn't make this post more confusing.

Jeff92se

iTrader: (82)

Interesting idea but you have to consider the following. If you do it like the Accord coupe style where the single exhaust pipe after the cat just splits off into two mufflers, I don't think there would be much benefit. Looks more than anything. Now the other extreme would be to run and individual pipe from each exhaust manifold to two cats then to two mufflers. This again would be a bad idea. You would lose the scavanging effects of the other 3 exhaust pulses. You could try to install a X or H pipe to help but $$ and space would be a limiting factor. Or consider the M3 style. Individual down pipes converge into one cat but it's a dual inlet/out type. Then two pipes into one large muffler w/ twin tips.

The New CLIMAX

iTrader: (1)

I don't have any pics with me but email me if you want and I can sent you a few pics. I don't know about performance b/c I squirted the juice, and to me it was fine.

Pepo

I installed a Stillen Muffler to my Y2K Max A/T and felt the car slower. I have Stl.YPipe and Stl.HighFlow filter with stock muffler, I even tried it with a Random Cat and it was sweting to reach the red line. So guys, if you want the best perf tri to stick with stock cat & muffler. One combo that I didin't try was the Stillen muffler with stock YPipe, but I bet it wasn't better than my actual.
Besides, no body has mention the extra weight!

Black VQ

psing23

and lets say a supercharger comes into play... how would it affect that?