malmasri

Wow that is Awesome....you should charge us for these write ups..

Nizer

Just getting a chance to view videos. Interesting that full Evo system with Sport valve open posted 102.6db while Race system posted 106.8db. They are essentially the same in that configuration, correct? Full Evo system bypasses the side mufflers straight to center muffler (with Sport on) while Race omits the side mufflers; otherwise all other components the same?

silverboy

Great read. There so many pics that it didn't load! Anyway, I'm curious why Akra didn't delete the centre muffler.

mikymu

Cool

As long as your OR has two post lift and your patient don't sue if I mess up

Any time

lol

I learn alot every time I tackle a project like this. No charge ... it's free

Yes, the Evolution system with exhaust bypass side muffler is much quieter than Race setup. This is due to the extra volume created by the side muffler which serve as some sort of sound deadening chamber.

Yeah, the image hosting site I used is ImageShack and they often have problem loading pictures. You just need to refresh your screen couple times and they should all pop up. Very annoying problem that often plague the image site. Let me know if there is a more stable free image hosting site

Carrera GT

I've found it's important to spray exhaust fasteners with a CRC or any penetrating oil and let them soak for a bit, otherwise, the heat cycles basically leave any threaded fastener "welded" tight.

It's also easier to remove the side and rear cans together rather than trying to get the rear can separated in situ. Clamp a plank to the pad of a floor jack and use that to support the exhaust.
And it's important to know what the service instructions require for anything going into the heads -- it's usually copper-based anti-seize, but you'd want to check.

Mikymu -- as ever, great write-up. Thanks!

micahbones

Mikymu your thread exemplifies why the Rennlist community is so incredible. Among the car forums I have perused, this is among the most thoroughly documented and helpful threads I have ever read. Very well done -- cheers!

prosper

Hi mikymu,

Thanks for the excellent post
regarding a more stable free image hosting,
may I recommend you try,
http://photobucket.com/ ?

It is FREE with much better interface and faster loading and uploading.
I used to use Imageshack, but
now I use: http://photobucket.com/

by the way, do you have any plan to optimize
your ECU/Software in the future ?
It would be another interesting experience

Carrera GT

The big G offers Picasa for free with Mac and Windows support (and the advantage of it being brain-dead simple to upload photos and choose private vs. published.) Apple's is even better if you want to print or create a printed photo album, but you can do that from iPhoto with less expense.

http://picasa.google.com/

jugger911

Great write up. You have no idea how much I was expecting to see videos at the end of that first post. Thanx for coming through...

tcsracing1

Just to reflect on this:

with Akrapovic and sharkwerks in place you are legal @ Laguna?

and if so, do you make more power with the sharkwerks center or the Akrapovic center piece?

Alas, which center piece do you now leave in place most of the time? preference?

Carrera GT

I imagine that's "Also" not "Alas." I share the same question: If this thing passes sound at Laguna, I'll take it! If it costs an extra $10K (considering resale value, too) to be able to put down a real lap without muzzling the engine with the vacuum switch trick or giving up completely with the "shift and lift" nonsense, then I'm dumb enough to pony up the dough and damn the warranty torpedoes, I'll pay for my own RMS replacement when the time comes.

D-Uber Cars

Mike,
Great write up as usual.
You must be one hell of a Dr. What do your patients think when you bring in the sound meter and video into your exam room?

rodsky

Awesome post. I watched the vid at TH - very cool. My 2 kids actually loved it too. They liked the music - which started in the middle. My 4 year old son loves Porsche racing vids. It was a fun 9 minutes - thanks for sharing..

mikymu

Good suggestion Adam as usual. I think the stock center section is a lost cause even with proper lubricant pre-treatment.

3D ... now that's interesting. I use to make 3D pictures for retinal specialist during med school. I will look into that

Thanks for the kind words

Good suggestion. I will give photobucket a try. I figured out tonight how to make my image better via imageshack. I basically had to pay for the "free" service ... something like $6 a month. There should not be any problem loading the pictures now.

Custom dyno tune is a work in progress ...

Any time

Yes, there is a very good possibility that I will pass 92 db at Laguna Seca with Evolution/Sharky center bypass as long as exhaust goes through side mufflers. My drive by db test was less than 90 as shown on the video. My next Laguna event is on 5/31 and I let you know how things goes.

Akrapovic center muffler with Evolution set up made slightly more hp compare with Sharky center but when you divert exhaust through side mufflers Sharky center bypass made more hp and torque .... and 8 lbs lighter which will make more difference on the track. Less back pressure with Sharky center can potentially aid with RPM response. I have Race setup now and will switch to Evolution with Sharky soon in preparation for Laguna Seca.

Full evolution set up will pass sound at Laguna Seca but you still need to plug the vacuum switch and that is true with OEM exhaust. I like the option of controlling the vacuum switch inside of the car ... when ever I needed

No worry on RMS leak or warranty. Just put stock exhaust back when you need dealer service

lol

Doctoring pays the bill for my car fetish

That is cool! I just learn how to add music in my video which spice thing up. Glad your little one like the video. Here is another one with background music. I was pretty slow in the video because I just got on track and waiting for my tires to come up temperature. Mike aka 996FLT6 is one fast customer. I could not keep up with him even when my tires are hot

http://www.youtube.com/watch?v=Pijx8VQqRDM

Nizer

Just reviewing your installation details. Perhaps the difference is due to fact that butterfly valve doesn't close completely on Akra system (as opposed to stock) thereby allowing some bypass to side mufflers to still take place relative to completely eliminated side mufflers on Race system....