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Izzone's Akrapovic install, Dyno and friends

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Old 01-11-2012 | 09:42 AM
  #76  
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Originally Posted by Izzone
AWE did dyno testing using a stock rear muffler and deleting the sides as discussed in this thread

https://rennlist.com/forums/showthre...ferrerid=66440

See the website for dyno teting

http://www.awe-tuning.com/products/p...t3exhaust.html

The way the Akrapovic system works is even when the Akra rear muffler is used with their Evolution system the side mufflers are totally bypassed when in "sport" mode or valves are unplugged

A Porsche rear muffler is designed to be used with the sides. When the valves are "unplugged" or car is in sport mode some exhaust gas is dispersed into the side mufflers at all times. Both connections on the side mufflers are used in both modes

Akra and Porsche rear is apples to oranges. One is designed to be a single pass rear (Akra) the other is designed to have pressure drop before inlet (Porsche)
The AWE link was very interesting. Looks like they did a ton of testing. At the end of the day I'm not sure its worth fooling with all this, especially at these prices. AWE's full system is $7k and nets a whopping 9hp. This might be more fun to tinker with if the prices weren't so ridiculous. $1200 for a set of pipes from FVD to bypass the side mufflers? Come on.... For me, at least for now, I'm leaving my center muffler bypass on, hoping that I didn't lose any power, and calling it a day. The car sounds great, it doesn't drone, pulled off some weight, and I don't think I lost or gained any power.

I do enjoy watching Randy spend more money on his exhaust than my daily driver is worth. I like living financially vicariously through my baller friends
Old 01-11-2012 | 01:03 PM
  #77  
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Originally Posted by deputydog95
Originally Posted by Izzone
AWE did dyno testing using a stock rear muffler and deleting the sides as discussed in this thread

https://rennlist.com/forums/showthre...ferrerid=66440

See the website for dyno teting

http://www.awe-tuning.com/products/p...t3exhaust.html

The way the Akrapovic system works is even when the Akra rear muffler is used with their Evolution system the side mufflers are totally bypassed when in "sport" mode or valves are unplugged

A Porsche rear muffler is designed to be used with the sides. When the valves are "unplugged" or car is in sport mode some exhaust gas is dispersed into the side mufflers at all times. Both connections on the side mufflers are used in both modes

Akra and Porsche rear is apples to oranges. One is designed to be a single pass rear (Akra) the other is designed to have pressure drop before inlet (Porsche)
The AWE link was very interesting. Looks like they did a ton of testing. At the end of the day I'm not sure its worth fooling with all this, especially at these prices. AWE's full system is $7k and nets a whopping 9hp. This might be more fun to tinker with if the prices weren't so ridiculous. $1200 for a set of pipes from FVD to bypass the side mufflers? Come on.... For me, at least for now, I'm leaving my center muffler bypass on, hoping that I didn't lose any power, and calling it a day. The car sounds great, it doesn't drone, pulled off some weight, and I don't think I lost or gained any power.

I do enjoy watching Randy spend more money on his exhaust than my daily driver is worth. I like living financially vicariously through my baller friends
The cheapest way for you to lose weight off the back is remove your semi truck hitch

Then concentrate on the exhaust
Old 01-11-2012 | 01:37 PM
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Originally Posted by Izzone
The cheapest way for you to lose weight off the back is remove your semi truck hitch

Then concentrate on the exhaust
Hitch only weights about 7 pounds. I would keep it on there even if it weighed 20. Cheap insurance to keep you off my bumper. Bully.
Old 01-19-2012 | 11:08 AM
  #79  
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too much weight, and also in case you touch the rear end it will cause a lot worse damage.
just saying
Old 01-20-2012 | 04:30 AM
  #80  
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http://www.mhg-fahrzeugtechnik.de/si...mainframe.html

these guys make some custom fab exhausts. Maybe a whole cup system could be fab's custom styles.


If cheep is what your going for, then make some side elbows at any exhaust shop,
drop the side mufflers and have the top holes welded shut on your stock oem muffler ~ Then you have the bypass to go back to if you dont like it and ontop of all that it wouldnt cost a person very much at all to give it a go... call it a day on 50$ parts & labour and be happy you lost a bunch of weight. Supersprint makes the cheepest premade elbows, ready to go for $732 then order those little block offs and bamn your good to go. It is the most cost effective side muffler bypass

This thread is proof that it sounds great and does the trick. I just think at first you need to run it for 20odd miles for the ECU to adjust thats all.

porsche doesnt work with cheep.

Last edited by lopro; 01-20-2012 at 06:03 AM.
Old 01-20-2012 | 09:37 AM
  #81  
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Originally Posted by aussie jimmy
drone is no good.
love affair doesn't last long...
my car sounds great above 3000rpms, but drones below. in the last few years (along with djing in my youth) it has caused my ears to ring 24/7. ears can handle the volume at wot, it's the 'booming, all-encompassing basslines' of the drone that is the culprit.
on track there is no drone, street is where low revs are constantly used in traffic stop/go. i am close to putting stock exhaust back on.
+1

I tried to live with it

Instead I just quit driving the car
Old 01-20-2012 | 10:37 AM
  #82  
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I drove my setup for a week now.
Bit of drone under 2500rpm.

But it is quieter above, less exciting then Sharky with cracked side mufler but better for phone calls.

Loud enough for track.
Old 01-20-2012 | 01:54 PM
  #83  
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I think today Im going to order the supersprint elbows and a FVD final muffler

http://www.fvd.de/us/en/Porsche-0/-/...tyle_Tips.html



http://www.supersprintna.com/product...arch_model/411



Does anyone think this would be a bad pairing?

Does anyone know where a fvd can be bought in Canada or US?

Last edited by lopro; 01-20-2012 at 02:15 PM.
Old 01-20-2012 | 02:49 PM
  #84  
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Back to original topic: Are we still waiting for the dyno sheets from Izzone's Sports Cup install or did I miss them?
Old 01-20-2012 | 03:52 PM
  #85  
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Originally Posted by Nizer
Back to original topic: Are we still waiting for the dyno sheets from Izzone's Sports Cup install or did I miss them?
If I had them I would post them, Eddie has them

Exhaust made essentially no power at he top and 6hp, 10 ft/lb through the midrange.

This was with zero time for ecu to adjust for our test

At the track this weekend it feels as if the car pulls harder, but not sure it's not just in my head

The exhaust has made me enjoy the car much more, the sound is livable and drone free
Old 01-20-2012 | 05:04 PM
  #86  
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in terms of bang for the buck, I think something with equal length headers feeding into side mufflers but with a rear muffler bypass would be great. The equal length headers and cat replacements would create power and the rear muffler delete would save weight. The akra is a great system, but their header design isn't really any different than stock.
Old 01-20-2012 | 08:45 PM
  #87  
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Originally Posted by Izzone

The exhaust has made me enjoy the car much more, the sound is livable and drone free
great outcome at any cost.
Old 01-20-2012 | 09:49 PM
  #88  
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Originally Posted by maroli
The akra is a great system, but their header design isn't really any different than stock.
Akrapovic is quite different than stock. Look at the port matching. Look how the OE tubing is welded inside the flange and effectively narrows down the port. Ak casts the flange and a short length of exit port together and attaches the pipe to the casting downstream. The OE is sloppy mass production for low cost. The Ak is finely detailed and done correctly.

Details like this are important to gas flow (making power). A perfect example of quality where the average person has no idea to look for it. A race engine builder would pick up on in a heartbeat.

Goolgle "Exhaust Port Matching" if you want to learn.
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Old 01-21-2012 | 02:12 AM
  #89  
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I thought we were not at the headers yet because IZZONES warrentee is not up and he cannot change them yet.

Are you sure savy thats not carbon build up on the bottom or left one?

the one runner your explaining has been casted and a pipe put into ~ wouldnt that be an area thats prone to cracking later on down the line and dont you think thats going to cause exhaust gas turbulance?

I re read this whole thread last night, we had been going back and forth with different options of exhaust setups while waiting for the dyno sheets, izzone and Trakcars setups with the benefits and drawbacks and I got the impression that they were unable to use the headers yet because of warentee issues. otherwise it would have opened up a new bag of worm interms of options.

Given all the info from post 1 does anyone else object to going with a fvd final muffler and supersprint side elbows to delete the side mufflers?
Old 01-21-2012 | 10:05 AM
  #90  
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Originally Posted by lopro
I think today Im going to order the supersprint elbows and a FVD final muffler

http://www.fvd.de/us/en/Porsche-0/-/...tyle_Tips.html



http://www.supersprintna.com/product...arch_model/411



Does anyone think this would be a bad pairing?

Does anyone know where a fvd can be bought in Canada or US?

you have PM.



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