[Rutger Gert-jan]

Hi,



I am a new member of this forum and I have to say it has been a great help to me! (airbox, chips), thanx !



At the moment I am looking at a sound pipe for my 968 conv. This sound pipe replaces the centre muffler (after the cat) my main goal is to get a better sound out of my car, any power gains are a bonus....my question is how will this sounpipe affect the performance? has anyone tried this before? It bolts directly to all the original flanges etc. so no hassle with the fittings <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />



Thank you in advance,



Rutger

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[Ryan]

wow, what is this sound pipe? I have done away with my mid-muffler with a straight pipe. It has made the exaust louder,but with a raspy rasberry at high RPM WOT. I had thought about adding a glass pak to take off the edge, but have done nothing yet. I would welcome a sound increase ....let us know wht this sound pipe is all about.

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[flash]

there are no flanges at the rear to bolt to, so this could be a real problem - the twin pipes are pretty close together too, so you may have a problem welding flanges in there (same with glass packs)



there have been a lot of attempts at working the exhaust on this car - all with little to no measured gains, or worse, torque losses - some have seen throttle response, and certainly tone improvement



however, you are probably going to spend a lot more money and effort and end up with a lot less performance than if you just bought one of the rs barn cat back systems - they sound great, perform better than anything else out there today, and are a lot lighter



give pete a call - he'll be happy to tell you all about the course of determination of what works

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[Rutger Gert-jan]

Flash,



I was told that all the parts bolt/ slide into the original system, so there should be no problem fitting this pipe. I agree that a RS Barn system would be the best option but, It would cost me a lot of Euro`s to get it shipped here into the Netherlands, not to mention the tax (19%) <img src="/forum/images/smilies/968/sad.gif" class="smilie" alt="" />

I can take some pictures of the piece by the end of next week, i will post them on the forum!



Regards,



Rutger

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[flash]

slide? interesting - i look forward to seeing it - i hope it isn't another company thinking that 944 S2 stuff fits the 968

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[Rutger Gert-jan]

        Hello,



I just got my Soundpipe for the 968 in.....see the pictures <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />



As it turns out it is made bij Cargraphic, and i think it looks pretty good, I will get it under my car this weekend, I will keep you posted!



Regards,



Rutger

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[flash]

the y-pipe looks ok, albeit perhaps a bit abrupt - but, i don't see any slip-fit for the muffler - from the shots, it looks like you will be either welding, or making a coupler

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[Rutger Gert-jan]

According to the company it should slide into the original pipes coming from the rear muffler, just like the original section does...to be honnest i did not look under the car to verify this....

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[flash]

the original is welded

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[Rutger Gert-jan]

Flash,



I just looked under the car, and indeed it is welded.... so this means I will be doing some welding and cutting <img src="/forum/images/smilies/968/mellow.gif" class="smilie" alt="" /> any tips to do this the best way? or should i order the muffler that is also availble from cargraphic?



here is a link of the exahaust options for the 968:http://www.cargraphic.de/index.php?/s,6,7,18,720,738/&start=3



Regards,



Rutger

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[flash]

i would not order any muffler without dyno tests clearly showing at least no losses in torque - i would talk to pete at rs barn about this specifically - he has info for you on it



if you are determined to use the factory muffler, i would remove it from the car, and then take it and the pipe down to your local muffler shop and have them expand the pipes so they would slip fit onto your muffler - then go home and mount it up with some temporary clamps - then i would have it welded on and remove the clamps

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[Darth Vadar]

Hmmmm... if one looks closely at page 59, #202-05 of the PET, the 968 muffler is shown as having a square 4 bolt flange to mate to the catalytic converter...

It appears from the above photos that there is a square four bolt flange that "could" possibly bolt to the Cat, at the front of the "Sound Pipe", thereby eliminating all of the muffler and resonator. Not sure that is going to be the best for performance, but I suspect the 968 will definitely "sound" racier!!!



In short, don't cut anything until you remove your old system and test fit the new pipe... and let us know how it works for you! Oh, and use LOT'S of PB Blaster to loosen up the old muffler bracket bolts first!

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[flash]

the muffler is in the back - the resonator is what bolts to the cat - that is what is eliminated by this pipe - the pet calls the resonator a "central muffler" as opposed to the "rear muffler"



the pipe he has will terminate somewhere just short of the muffler - dropping the entire system will allow a side by side determination of where to cut the pipes so as to be able to account for the slip fit amount and the welding



somewhat of a big project no matter which way you look at it, with 2 runs to the muffler shop (since you can't drive it without any muffler at all)

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[Darth Vadar]

Ah Ha! Yes I zee vat you meen!



The usual case of rectal obfuscation applies...



just need to get my head out of my... well, there you go!



Just start talking exhaust pipes and I get all confused!

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[Ryan]

Rutger,



This is pretty much what I have done to mine. The rear muffler on the 968 is pretty loud without the mid-muffler. Not bad sound at low to moderate throttle, but kind of harsh at wide open.



A muffler shop could easily put this on for you. You might want to look at another muffler, in which case the pipe you have there could be substituted with a single tube from the CAT back to the aftermarket muffler.



Flash is right to look for a proven system that does not rob any power. Hope this helps.

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[S_Cal968]

Just curious... has anyone swapped the center muffler with a glass pack muffler? This configuration reduces noise w/o flow restriction. I'd bet Thrush makes one that should fit...

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[flash]

i used a glass pack in my sebring system - worked fairly well, but the louvres caused some turbulence that could be seen on the dyno



never tried it with the oem muffler because of the twin tubes

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[Rutger Gert-jan]

Ok, The "sound pipe" is fitted. It took me the best of my weekend, but hey, a hobby consumes time and money. <img src="/forum/images/smilies/968/wink.gif" class="smilie" alt="" /> In order to get it right I made a coupler, so that I can fit back the original centre muffler(the front was bolted to flange from the cat, so no problems there). In time I will get the rear muffler as well and get it all welded up....



The sound it makes is not bad at all, it sounds a bit like my father`s 964 C2 (also modified exhaust). Only when the trottle is all the way open there is a loud rasp...



Performance wise I can not tell there is a really difference, a dyno run would be the best option. I also think that Cargraphic (german porsche tuner) knows what they are doing (any other opinion is welcome) I will send them an E-mail and ask if they have any charts.



Regards,



Rutger

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[flash]

call pete at rs barn for an opinion on the "performance" of the cargraphic stuff for this car - he knows about the results of tests on it

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