speed21

^1Gunner, Tomorrow. Won't have the time to collect it till following day. Stay tuned. Now if you don't hear from me it can only mean one of two things. 1) it is that good I can't stop driving it and have wound up on the other side of the country or, 2) it is back in the shop coming back off. It has to be 100% for me. So yep the expectations are high but, I'm also ready for a fall too. It's an each way bet at this stage.

mils123

Hello, I am new to the forum. I enjoyed reading the thread. I now have 2k on my 991 TTS and ready for AM exhaust. It's difficult to get a good sense of how the exhaust would sound on the limited youtube videos out there for the handful of products (GMG, EP, Tubi, FS and Cargraphics).

My dealer recommended Tubi and heard the exhaust notes in person on an install that was on a 991TTS. It is a matter of personal taste and preference, but I felt the sound was still lacking and did not match the aggressiveness that the 991 TTS demonstrates in performance and appearance. Based on the youtube videos out there, the AWE-tuning exhaust seem to have a nice NA type sound that was loud enough but not obnoxious. Anyone have any experience with AWE-Tuning 991 TT exhaust or consider installing one? Thanks in advance.

speed21

Don't want to put you off Tubi but are you up to date with this thread? Tubi cats are total crap by looks of this. Not good.

https://rennlist.com/forums/997-turb...onverters.html

If you were after a complete system you really need to know are the cats HJS Emitec, and, have the cores been pinned in any way shape or form. If someone has modified a HJS cat then for all you know it too may be full of restrictive pins. So you would want the details on that in writing.

speed21

Hey Gunner! It's on buddy. In brief I just wanted to say I feel sorry for you now hehe....damn i'm cruel. Totally too good. They did it again. What was I thinking it wasn't going to work out..duh...i think I must have got too caught out in believing the stock was the be all end all for this car. Fool me. Bake me up some humble pie for even thinking that i'd jumped in the wrong end of the pool. You stock guys have no idea what you are missing out on. It's beautiful. No drone, and the sound and spool....i've gotta go.

NVRANUF

LOL what a tease, though expected no less from speedy, but sounds good, figuratively.... as I haven't heard one yet!!

Is there any burn-in or run-in time to fully get to the EP's full sound potential?

Just to confirm, there's zero/nada/ziltch drone at 1800 to 2000 RPM at hwy speed, which is the engine speed most used during long trips??

speed21

If I am "teasing" then I'm probably best not saying any more here on this thread, after all it was supposed to be about a consensus, not my EP review. Re my thoughts expressed in this post and above, when I get more time I will post a new thread and detail my findings. I have a few install pics as well. All going well, by mid to late next week...

To briefly answer your questions for now 1Gunner, the system is very quiet on cruising. There is no break in period as per Stefs advice. The annoying continuous mild resonance which you are refering to in the stock system, which as you know is there basically all of the time appears to be completely gone while driving at cruising speeds now with the EP. I recall before when in 4th (sports mode) cruising along between 1800 and 2200 you would always have the constant resonant hum. Now in those exact same situations there is nothing at all...silent...nothing. It is only when you actually re apply throttle to pick up a higher speed that the engine sound kicks in, and on those occasions the engine can be heard from inside louder than before and the low rpm noise is more broadly spread and louder but is not as needling to the ear as it was. I think that is the change in tone in that range but you could still say it is resonant in the same way as the stock during those brief on throttle actions when throttling the engine in a way that is trying to lug the engine. All in all the car is certainly more enjoyable and more sporty though. Throttle response is improved and the engine will growl more when you get up it. There is no resonance on those occasions as was the case with the stock system. Sorry for the late edit but realised I hadn't addressed your immediate questions so hope this goes toward helping to answer your questions for now. I will elaborate more later when i put some more miles on and in differing conditions....on a new thread.

Cheers

bigdogtex

Test

speed21

Love the garage! I guess things really are bigger and better in Texas bigdog.
Now if i could buy these cars at your prices we could have a garage competition on our hands.
Btw what are you testing?

enzom

Not much discussion on headers in this thread. Have people decided that headers are not worth the investment given the cost-benefit? I always thought headers were important to upgrade because of the inherent cost-compromises in an OEM setup. Is that not the case for the 991 TT and TTS?

speed21

Can't answer for other 991tt owners but from what I've heard on headers is that in general they appear to be more about show than any real go. Then there is the issue of them cracking on the welds and so on. It's really hard to beat a cast header for reliability especially on a turbo which generates so much heat in that area.. For my money I wouldn't bother but to each his own. What good is performance without reliability, least of all not being able to feel any tangible gain for the $ spent? Bit like an IPD plenum.. Could anyone honestly say they could feel any difference afterward and keep a straight face?

enzom

Guys - how long did it take to install your exhaust systems? I got a quote of $1,200 from a local dealer. That seems like more than ten hours. I know that the rear bumper has to come off, but how hard can that be?

speed21

Agree the bumper and rear lights are the easy part. The hardest part of this particular r and r is accessing the 10 and 2 o'clock nuts (out of the 4 that hold each cat onto the back of the turbos without having to remove the IC's. You need to have the right specialised tools on hand .

Removing the 4 02 sensors in the cats is also quite tricky and time consuming. The correct way is to firstly unplug them all from the wiring harness in the upper engine bay, carefully releasing the wires from the retainer clips on the inside body of the engine compartment then lastly unscrewing the 4 sensors out of the cats, and preferably once the system is off the car. Many installers aren't prepared to do the job properly due to the time involved and just unscrew the 02's from the cats only and twist the wires up into a very nasty knotted bind which is a potential for irreparable damage or failure at a later stage. The sensors are very expensive and need to be handled with care!

If you have the correct tools which allow the removal of the 10 and 2 nuts without having to remove the inter-coolers (this is a real time saver), and are familiar with the process of removing the 02 sensors correctly then by rights 4 to 5 hours should see the job done IF the system is a precision fit.

It can also come down to the brand of system you plan on installing as most are not the precision fit as claimed therefore will require certain corrections which can take time. I personally would recommend you have your Porsche dealer fit the system rather than some auto shop with zero experience working on a 991tt.

enzom

Thanks. So that would suggest that this dealership may not have the appropriate tools. Waiting for another dealership to return my call and email with quotes. I told Stef at EP that I would get back to him as soon as I knew where he should send the exhaust.

neanicu

I think what speed21 is referring to is a gear wrench. Let's face it : I haven't worked on a 991TT,but knowing Porsche,I am pretty sure they haven't changed the design so drastically that it's something we've never seen from previous Turbo generations. Yes,the intercooler is in the way so you can't really come with a power tool and extension/socket set up from the front but a gear wrench will do that job instead. Either way removing the intercoolers is a breeze if you had to,not to mention you're dealing with brand new fasteners without any rust. I'd say for someone that's done it before,it shouldn't take more than 2-3 hours.


P.S. Here's an illustration from the 996TT. 4 studs secure the cat to the turbocharger with 4 nuts and washers : No 7 and No 8 in the picture.

speed21

Well it is possible they don't have the "craftsman" type wrench and that will mean the IC's will need to be removed which as neanicu says is no big deal but still extra time iykwim. Plus as the owner it's always nice to keep as much of the car as undisturbed as possible given it is brand new.

Now If you are fitting an EP well that one is a precision fit for certain and also comes supplied with the special wrenches to allow access to those difficult nuts, so that will shorten the install time for sure. I still think 1200 is way too much in your money and at most half may be acceptable if not still up there by a hundred or so. But on the up side, even if you do end up paying half of what the existing high quote is at least you have an official dealer involved and that counts for something on a car like this. Having them actually see and fit this system will also reassure them as the dealer with regard to the factory warranty. I am quite sure they will be very impressed with both the system and the end result.