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Discussion Starter #1
why are there different exhaust setups? what are the pros and cons of each exhaust set up? is it true that a 4-2-1 will give you better low-midrange power -vs- the peak power of a 4-1 setup? also will a high give less power than a standard pipe because of the curve? for example the standard yosh RS3 and the high yosh RS3? I know alot of ?'s but I need answers so that this winter I can install a new exhaust. And yes I know Akro is the best, by the way I realize that it is quite but can't you just take out some of the damping material in the canister before you install it, wont this make it louder?anyone done this?

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I think so, I am not really sure.

I think I heard that a 4-2-1 has better low end response and a 4-1 has better high end response, but then again it may be reversed. LOL I am not sure.

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I think the pipe for you would be a Muzzy. I believe Team Kawi uses the Akro cause they spend a lot of time up around the 9, 10, 11k range where they're looking at peak power. Muzzy pipes will turn out some impressive numbers and won't be that far behind the Akro up top. They will probably have better midrange numbers as well.

My opinion from some of the numbers I've seen would be pretty inline with what Easy said: 421 better midrange, 41 better peak.

As far as the pipes being loud, I just bought the Akro and the sound is awesome. It's more of a low rumbling noise at idle. And nice and loud under acceleration.

The Muzzy pipes are even louder, more of a raspy obnoxious loud which is what made me want to get one of those.

I don't regret getting the Akro, but I think you would like Muzzy pipes.

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I have a Micron and a PC3r on my 2001 (4-2-1). My cousin has two 12's. One (2000) with a Akro (which he takes to the track alot) and one (2001) with a Muzzy, which he rides for fun. At my request he rides my bike to compare the performance with his two 12's. He says that he loves the Akro, and it's better than both the Muzzy and Micron. He also says that he gets more out of my Micron than his Muzzy. This comes from somebody that race his bike all the damn time. (One thing though.) He doesn't have a PC3 on either of his bikes.

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Discussion Starter #6
I think I will be going with the Akro( I wish they had a larger selection of finishes available), Muzzy looks cheap(I realize it is a good pipe), I think that the only reason people even have them is because they were the first ones to provide an aftermarket pipe for the 12. I wish someone had a renegade dual high pipe system that would comment.

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those dual highs look cool but I personally don't think they'd perform that great. Your ass would get hot too with those pipes under there. If you get the Akro (I'm VERY happy with it) get it from Doug at SpencerCycle, you'll get the best deal BY FAR

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Discussion Starter #9
yeah they do look really nice but 1200-1300 dollars? are they crazy? If I did get them it would be only for looks, and I'm sure they do have performance gain over stock. According to there dyno 10hp not bad. But then again you know they posted the best dyno run that they got so I wonder just how many times they had to dyno it to get a number that high.

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4-1 pipes are used for DragRacing...More midrange

4-2-1 pipes are used for RoadRacing...More top end



This is what I was told...





CrotchRocket

" I just live my life a 1/4 mile at a time "</p>Edited by: <A HREF=http://pub56.ezboard.com/bkawasakizx12r.showLocalUserPublicProfile?login=crotchrocket>CrotchRocket</A> 
at: 10/4/01 6:45:43 am
 

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Sndnga, you need to go back and read earlier posts about Akro pipes. Doug at Spencer Cycle sells them for less than $950, including shipping. In fact he has special deals which include PC111R/K&N Filters/ Akro. You just can't beat his prices. Only a fool would pay $1,200 for one.

Check out the site spencercycle.com



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That's about what I got mine for $944 with shipping to be exact. I originally wanted the Akro but I was going to settle for something else cause I wasn't going to pay $1200 for it. Then I found SpencerCycle and I'm so happy I held out for it! It sounds SOOOOO nice!!!! It rumbles at idle and is loud as hell when opened up

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//Nerd Mode on



Here's how I understand it.....



The exhaust generates a pressure wave where the pipe diameter changes. In a 4-1 pipe, theres a strong primary harmonic pressure wave and and a few others. Since there's only one diameter change, these harmonics don't interfere with each other. This pressure wave travels back up the pipe towards the cylinder. When the negative portion of the wave coincides with an exhaust stroke - and more particularly the valve overlap between the exhaust and intake, more exhaust is scavenged and more fuel/air mix is drawn into the cylinder. When a positive wave hits, it doesn't allow as much exhaust and the cylinder gets a short fill. This manifests as a big ugly flat spot, followed by a neck-snapping high spot. The RPM range where these harmonics hit are tuned by the length and shape of the headers.



A 4-2-1 generates several smaller waves at different frequencies. These waves act directly on the motor in the same way as the 4-1 pipe, but they also interfere with each other, both destructively and constructively. Therefore in a 4-2-1 pipe there are lots of harmonics for designers to work with. A well tuned pipe (such as the Akro by all accounts) provides a smoother effect in more spots in the RPM range.



I have a Muzzy, and in my experience (1 bike), it's tougher to tune the fuel across RPM than others I've heard of. It has a big harmonic right around the idle(which really fucks up the idle), another strong wone right at 3K and then it's pretty damped and smooth from there on up.



Anyone else have something to add, or if I've got it wrong - post away! <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/smile.gif ALT=":)">

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I can tell you that there are absolutely NO idle probs with the Akro. She lofts the front wheel much smoother now

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Discussion Starter #16
When I said 1200-1300 I was reffering to the dual high pipes from Renegade. I will definetely talk to Spencer Cycle when I am ready to order it. Thank you everyone.



One more thing: is the akro TI/TI or SS/TI/CF? or can you get either one?

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Apparently there is an Akrapovic Evolution system? that is full Ti. But when I purchased my Akra I only had the option of a Ti or Stainless link pipe with SS headers. All the CANS are Ti construction with either Carbon Fiber on the outside or Ti.



The advantage to a Ti header is that you can wrap it. Most people don't like wrapping Ti headers due to the metal fatigue that occurs.



There is not a big weight difference either way. I would save the extra money on the Ti header and put it into a PCIIIr and if you have more money burning to be spent then get a Hans Monster Ram Air intake manifold, then hang on to your goodies when you ride.



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Discussion Starter #18
I've been seriously looking into the akro lately as a birthday is comming up and will treat myself to it. From what I understand the old akro is a 4-1 setup and the new Evolution is a 4-2-1 setup with some type of connector pipe, kinda like the yosh RS3. I wonder why the changes?

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My Akra has the individual header tubes going into a collector that has a divider down the center join for a few inches which makes it a pseudo 4-2-1 pipe, it also has the balancing tubes between the different header pipes.

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Amen to that. <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/smile.gif ALT=":)">



I was weighing in at 215lbs but I am down to 207lbs which is still 10lbs more than I weighed when I used to do Triathalons and ski 40 days per year. A computer jockey career has not been nice to the physique. LOL

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