There is a 991 C2S Cab that is on a lot and 99% of what I want, but without the PSE. They can put either Tubi or PSE on at the dealer and I will have the little button either way too. Any input would be appreciated on which way I should go?

 

Can you do a center muffler bypass on the 991? I believe u can, in which case that would be a hell of a lot cheaper and probably sound great. If not, PSE all the way, the way the car was designed - with the exhaust note working in conjunction w the ECU, crackles on the overrun etc

 

If you can stomach the cost, Akra!!!!

 

pse, imo

 

PSE IMO as well, plus there will never be a question regarding your warranty from PORSCHE

 

I'd definitely go the PSE over the Tubi. I had a Tubi on my 997s and while it was ok sound wise it didn't make any extra power or anything. Actually felt like i lost a bit of pulling power in the upper revs too. Didn't feel as as crisp or willing as before. Had a slightly better throttle response from the get go but that was it. PSE would have all those issues sorted plus its a factory option that will always have a greater value and attraction to the next buyer. I just don't see Tubi as doing anywhere near the level of R and D that is required and like most of these AM systems just focus on the noise. I also wouldn't believe any claims it makes power. The same was the case on the tubi i bought for my turbo. It was total crap and i got rid of it. I would agree with another poster who said the Akra. While its expensive you will definitely get a power gain along with the sound because this company does the R and D properly. You ultimately get what you pay for and there are no free tickets with 99.999% of these AM systems. Akra would be one of only very few i'd recommend if you didn't want the PSE.

 

Pse for sure!

 

I would not want. PSE. Way too quiet for my taste and they all need a flash to maximize performance So I would save r money as no one has hacked big brother yet in the 991 to my knowledge.

I am sure PSE would have good performance but keep in mind this is a factory option which means it has to meet all EU noise, emission. cafe standards, etc so likely more restrictive than anything AM.as for comment your 997 tubi didn't add anything HP, did u flash it? If not that's why and if you did with what software. I know EVOMS add HP but there has been debate about other tuners.

Last question I don't believe there is center bypass on a Carreras. Weren't on 997s.

 

Hmmm....with all due respect Speed, I don't really think you know enough about the company to make a generalized statement like that. In fact Tubi IS actually one of the very few companies who DO actually perform a lot of R&D before manufacturing and exhaust. For the most part, the Porsche line of Tubi exhausts are more or less designed and tested by us here at our facility, and simply sent to Tubi in Italy for final manufacturing. We would not release an exhaust if it lost power..lol. This video shows a little bit of what they do at their facility in Italy.


In your particular case...it's strange that you "felt" a loss of power. Did you ever perform any documented testing? Every time we've ever put a 997 on the dyno with Tubi installed, it has showed a consistent gain in power, and we can continue to sell 997 systems every day so they must be working out pretty well.

 

Hi Tom and thanks for chiming in. I wasn't aware CMS was behind the inventing and testing of these systems and tubi was just a manufacturer. I always thought Tubi was responsible for the inventing and testing processes. Whilst I note you guys generally have good products (eg i use your RF 67 wheels) I can't really say I've found your Tubi exhausts much chop at all, particularly the 997tt.1 system. In so far as my personal claims go they are 100" accurate. I am convinced of that and i don't say something without giving it a great deal of thought based on first hand experience.

The 997S NA Tubi system was satisfactory in terms of fit up and noise produced. I also noticed a slightly improved throttle response from the get go but that was short lived as after that the rest was harder to gauge in terms of improvement in performance. However over time the differences became more obvious. The mid range seemed to have a touch more torque @ 4 to 4500rpms but the car didn't feel to rev out at crisply or as willingly as it did previously with the stock system particularly above 5000 to 7000rpms. I didn't have the inclination to remove it as i was generally satisfied and used the system for @ 2 years but when i sold the car and refitted the stock system again i again experienced the same thing where the car became more elastic and willing over 5000. Incidentally, within the period of use, my personal experiences included numerous track days where i was regularly mixing it up with a range of 997S's most which had the stock system. These were all Porsche track days organized by Porsche where i was a member of their Motorsport club for a few years running. On more than one occasion i had engaged friends down the main the straight only to find my car was only able to keep alongside, maintaining the same pace, not pulling away or gaining any lead at any stage down the straight right up to the first braking marker. I would be able to get the car up to @ 210/220kph before having to stab the brakes and re -apply throttle through the sweeper. Note this is on a straight, not corners where skills can vary. In fact when the car engine was operating in the upper rev range id've said those cars with the stock systems held a slight edge over me...which was quite surprising. I don't really care for what you say your dyno says because dyno figures are so easily manipulated and often do not give the true picture in real world operation. I know these dyno charts can work well as marketing tools but where i am concerned the seat of the pants and other physical evidence can give a good enough picture to the operator indicating if the car is has gained anything tangible from how it was previous to the mod. Much the same as when a tune goes in, the operator gets a handle on any gain iykwim. So whilst i was generally satisfied with the NA product i wasn't going to have a lend of myself imagining the car had gained anything tangible in a real world driving sense beyond the initial throttle response sensation. If i can describe the feeling between 5 and 7K, it was if the engine was a bit flatter in the way it revved out.....not quite as crisp or slippery in sensation. Still not bad though but not quite as good as how it was with the stock system.

Now on the turbo system that one is an entirely different story, and without boring the NA 991 owners on this section it is suffice for me to say that system definitely lost power in the mid to upper.....no question. The other issues associated to poor fit up and the drone are separate issues again but not to be taken lightly. If you guys were indeed responsible for the invention of this system with respect you really need to go right back to your drawing board because it's an absolute shocker....and that's being very kind.

To compare it back to back to the Europipe EP1 which is what i have on the car now is ridiculous....because there is no comparison on any front. To quote the term "Chalk and Cheese" would be a monumental understatement of epic proportions.

 

Just to clarify...they also play a large role in some of the process because of the engineering and flow-testing equipment they have on hand at their factory. We act more as a partner, influencing the initial design and assisting in the final R&D which is all done here at our facility. No Porsche system gets the green light until it has our approval.

While I very much respect your opinion, I'm going to wholeheartedly disagree with this. Saying that your "butt dyno" experience is a definitive way of measuring a performance increase is...well...ridiculous. Especially during any sort of track environment, how is it even humanly possible to erase every other possible variable and attribute any loss or gain of performance to our mufflers? Could it be that your car was hot after a few laps? Maybe you entered the straightaway 5mph slower or faster then usual? You must realize that there are more factors contributing to your speed down the straights then simply the power of your car?

I also find it a bit insulting that you would suggest that we would manipulate dyno numbers simply as a marketing tool. Actually I find that very insulting. We use our dyno as a tool for testing and development. If the 997S system (or ANY performance part we sell) doesn't make power, then we don't lie about our dyno numbers. We do what we do best, engineer, re-engineer, and re-test....until it does work! I think the information we share on 6Speed, our facility, our team, and the quality of our parts speaks volumes more then your accusation.

 

I have spent some money with the people at champion motorsport over the years and never ever did my car leave slower than it went in.

 

Can you use the OEM sport exhaust button for aftermarket systems, ie Akra or Tubi.
Button and parts? Will the sound change with the sport and sport + button engaged if you don't have the button inside the cabin???