Ken's corner #6: Exhaust

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Postby boMex on Sat Oct 04, 2003 6:37 pm

Keo wrote:I've found an interesting exhaust. It gives you more performance, less headaches and less attention from the police :)

The yashio factory super silent exhaust

A guy made a review on it with video clips on FA
http://forums.freshalloy.com/ubbthreads ... o=&fpart=1
You could prolly build something like the Yoshio(which has really fugly welds for what it costs) out of any 3" JDM canister exhaust. Just slap a tinty 3" SS Magnaflow muffler somewhere on the mid pipe. Cops will still love you beacause of the ricer can hanging off the ass of the car.
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Apexi catback

Postby 240sxfreaks on Wed Aug 17, 2005 2:03 pm

Is the N1 Apexi catback real loud? We are looking for a nice catback for our ride but rather not annoy entire community with the car any advice would be great .
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Postby Nismo on Wed Aug 17, 2005 2:07 pm

If the car is naturally aspirated yes... its very loud.

If the car is turbo... its average noise levels for a turbo car.
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Postby Dom on Wed Aug 17, 2005 4:23 pm

just get the silencer with it

APEXi N1 Super Silencer
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Postby Nave on Wed Aug 17, 2005 10:57 pm

Also know as the engine plug, no good if you want to get on it all the time. They are good to keep around in case you get stopped though. I would just get a muffler that you think is quiet enough and reserve the silencer for special circumstances.
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Postby 240sxfreaks on Thu Aug 18, 2005 7:24 pm

What catback system would anyone suggest here one thats got attitude and good sound not a real loud ,any advice greatly needed.
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Postby Nismo on Thu Aug 18, 2005 7:40 pm

Most of us are firm believers in making your own exhaust system. Not only is it cheaper but the fitment can be custom tailered to hug the underside of your car. Ken, MRW, Nave, Biz, and myself all have custom systems.

Dom is running a Blitz NurSpec R, but it would be way too loud for a naturally aspirated car.

You want to look for something that has no bigger than a 2.5" diameter pipe. Something that comes with a resonator, and something that will have an optional silencer. Stainless steel is always good too, they last longer in our shitty weather.

Here is a prime example.
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Postby hot_waxx on Fri Dec 23, 2005 2:54 am

I'm considering buying an Apexi Dual N1 exhaust. Would this be extremely detremental to low-end power for my CA18DET?
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Postby Nave on Fri Dec 23, 2005 3:00 am

Turbo = the bigger the pipe the better. What is the dia of that exhaust? You won't have to worry about bottom end, just top end if it doesn't flow enough.
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Postby hot_waxx on Fri Dec 23, 2005 3:19 am

I know that bigger pipe is better when it's turbo, I'm just wondering, because it's a 3" pipe that splits into two 2.5" pipes, if the combined 5" would be too much for what the CA can push....?
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Postby mr_240sx on Fri Dec 23, 2005 4:31 am

hot_waxx wrote:I know that bigger pipe is better when it's turbo, I'm just wondering, because it's a 3" pipe that splits into two 2.5" pipes, if the combined 5" would be too much for what the CA can push....?


dont worry, the n1 dual will be jsut fine
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Postby Nave on Fri Dec 23, 2005 4:40 am

Time for a little math lesson.

Surface area of a circle = pi x r ^2

For the single 3" exit you would have a surface area of 3.1415(pi) x 1.5^2= 7.0686 in^2

For a single 2.5" exit the calculation yields 4.9087 in^2

But there are two tips on that exhaust you say, so double it to 9.8175in^2

How bout that, marginally more that an single 3".

To put it into perspective, a SINGLE 5" would have a surface area of 19.635in^2, roughly double the area of TWO 2.5" tips. The square factor is a bitch isn't it.

Of course, it makes NO DIFFERENCE anyway. Turbo = biggest you can put on and can afford, litterally. If you ran it with nothing after the turbine it will run exactly the same, been there done that.

The only way the exhaust matters is if it RESTRICTS flow.

Have your report on my desk by the end of the day.
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Postby hot_waxx on Fri Dec 23, 2005 1:32 pm

Thank for the enlightenment. Forgive my noobishness, I'm in the process of learning as much as I can. :smile:
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