Got it but dealer says if Akra are really best in industry then why they not use non CEL cats then?? Reasonable conclusion? So in regards to cats really no diferent to Kline and FS ...And still 997 2 pipe look, not 4 look which is 991.....not 997. Muffler is good quality and light but costly tho. Maybe it will take 4 pipe look? But no 4 pipe coming from muffler so...hmmm....how to fix/?

 

High flow cats are, I would say 90% chance, most likely will not give you a CEL. Keep in mind it doesn't have anything to do with emission certification, just the car letting you know your cat is not working at 100%, which is btw kind of what you are looking for.

Akrapovic business model is sell products that dont need software mod. Even if You could never see a CEL with their high flow cats they are kind enough to let you know.

But again, if you are worried about emission complaints stay with stock cats. If you want as much power as possible why would you want a cat designed just to avoid CEL and not power?

Tips is personal, your call

 

That's not how it works in the US. Perhaps in Chile things are different. We have laws preventing the use of aftermarket parts from allowing a manufacturer to remove themselves from the obligations spelled out in their warranty for any malfunction not directly attributable to said aftermarket part.

We picked that up awhile ago. You haven't been subtle.

 

In Chile is kind of worst. I was talking about the generic policy in Europe actually.

Could you elaborate on those laws? Interesting

 

http://www.autoanything.com/popups/MossWarranty.aspx

 

Wish we had anything like that here.

 

I have been sifting through this thread - so, to be clear...if I buy any exhaust other than Akropovic, or OEM, it's basically junk...

So -

Fabspeed
Kline
Borla
MagnaFlow
Flowmaster
Gibson
Greddy
Corsa
ARK Performance.
Pypes Performance

...those are all junk, because they're not OEM and not Akropovic.

So I suppose the same thing is true for all other aftermarket car parts as well? I just want to be clear so I know what parts not to buy in future...like Cobb and GIAC for example, because they are NOT OEM and don't have sales in the triple digit millions (I'm guessing at that number) like Akropovic, and therefore don't have R&D worth discussing, right?

 

Agree Akra is very good quality pipe but 4 hole tips NOT fit on to muffler as I said to you before. Possibly muffler is recycled from older 997tt stocks, as has same single pipe each side but is not made like 991tt muffler design with 4 pipes from actaul muffler for tips to fit to.

You also saying 90% chance not CEL happening? But Akra warn on Web info advise remap ECU is mandatory with or without Cats so again dealer is 100% correct these are not suitable for stock ECU...same problem with Kline FS etc.
Yes all pipe systems will jeopardise factory warranty but clear advise from tech to me today is again to only fit pipe and cat with suited design for 991 turbo car that will not causing cel at any time as they find. So dealer still advising EP is "best" in their experiences for no CEL and reliable operations if i like to get more noise. Make sense?

FYI please read Akra link below which is explaining ECU to be re mapped if using their cats and delet pipe too:

https://www.akrapovic.com/#!/car/pro...44&yearId=3903


edit: It clear truth about problems not appreciated here on 6 with such large negative reputations giving out now against me and others. Odd behaviour indeed....like little angry spoil kid not getting his ways. Sambo saying before best I do my own proper reseraching, but facts and valued info from dealer not suitable now as it not favor what he and some selling here It looks like. Oh well.... truth hurt huh.. Maybe 6 Forum just place for seller to instruct member to buy only what they sell or else you get insults, sarcasm, and negative reputations like what is now happen. Pity.

 

Well, no...
The thread is about to understand what you are buying, so you get exactly what you want.

With exhausts, there is no objective overall BEST, since some subjective preferences come into play: looks, sound, some may want power over all others, some weight, some just sound. So you price your gain in those points combined.

OEM is just the spare part. Exhaust probably manufactured and designed within budget to comply with sound and emissions regulations.

We could say the technical best is indeed Akrapovic, but if I'm not interested in moderate sound for sure it wont, same if i dont like the tips.

Maybe if I have a CGT I'll want straight pipes, if I have a 355 I'll want some loud Kreissiegs...

R&D takes money and time, a small Company will have a hard time with that. No secret.

Exhaust are a VERY important part of your Car, is just usually they dont get enough credit. Ask somebody who knows about 2 stroke engines or haved worked with endurance cars.

I hope this is constructive, there is a whole world with exhausts, it is a good read and very interesting.

 

Honestly , you have a lack of knowledge of how ANY non OEM catylzers effects emissions( they are always increased) and what the increased emissions CEL really means . The secondary oxygen sensors detect the amount of emissions post catylzers. When this value increases above a set point in the ECU a CEL light spears on the dash to let you know an OEM catylzer or any other is no longer keeping the car at its emissions target for environmental protection reasons . It in no way negatively effects the function nor the reliability of the motor to have an emissions CEL . After a few thousand miles any high flow catylzer regardless of cell count may not meet OEM targets anymore as even the 200 cell or 300 cell options have much less material than OEM . The reason to use a 100 cell high quality catylzer like an HJS catylzer that Kline , and others utilize is to have near catless flow ( max power gains ) but still cut out the horrible fuel smell and soot that comes from running a full catless system . Some like myself want maximum power without smelling like a gas can when I roll my window down lol . Given your fear of warranty coverage I would reccomend you leave your catylzers stock as any aftermarket high flow catylzer will at some point give an emissions cel without a tune after X number of miles .( might be 5k,20k ) but it is likely to happen . It's certainly no risk for your motor for this to happen , and no reason for a reputable dealer to deny a warranty on your engine . (Tunes just turn off the warning light FYI )
My two cents.

 

Thanks for explaining this to the ones not aware yet.

Exactly, you get and option in the ECU you are flashing justo turn off the post cat lambda, as simple as that. Akrapovic just makes their business model as hardware with no software needed, any that's why they use the Delete-R, just to avoid the CEL to show up. An as said by GMD, it means no harm

 

Yes so I'm told which why I respect the advises from the trained tech working on our turbo cars including many "modded" for track with non genuine parts. So they get to see which part is which and what part is not so great as some claiming here just to sell. Techs like always good outcomes for car and customer so warranty problems avoid where possible. I am good customer so they will always give me good explanations and advises even if part is not genuine brand.

Thanks for your concerns gmd2003 but no need for lengthy explanations already fully explained to me by techs about CEL and all causes. I DO understand. High flow cat is one good thing to have on car sure. BUT no CEL light coming up on dash is another good thing you can also enjoy. High flow cat with no CEL is best solution end of story. And it is available so why sacrifice for one which is problematic? Not everyone has disrespect for environment and run without cat. Too much pollutions already in atmosphere YOU and I breathe! Now, if some here cant make high flow cat reliable to not cause CEL it is not my problem!! They should do proper R and D to design properly and not seek to just make excuse or BS sale story and avoid costly R and D. Why not improve products to make them work properly for car and buyer they sell it for eh? Maybe hurt profit? Or maybe not enough profit to share with Mr 10% sale agent? Hmm more likely scenario I think!!
Btw dealer say it is BS that OEM cat will make cell after 15 20K mileage....say maybe if there is wrong aftermarket tuning giving too much fuel then yes. And why turn off light anyway? That is just covering up problem. No need to cover up problem when 100 hi flow cat with no CEL light warning ever is available.. Some just need to do their "searching" properly and they will find the facts on it.

 

Sir I know you are pro Akra and thats totally awsome! But you should really read akra link i put just for you as it clearly say retune is mandatory for ECU when using their cat and their delete -r. pipe So why you continue to ignore this truth from them and make out what they say is incorrect i do not know? If only Akra made 100 cat with no CEL and put 4 pipes on muffler to suit 991 tt car I will seriosly look at it for my own car.

 

You still dont get the point here.
The main focus during design is not avoiding a CEL.

You seem to be looking for less contamination and more power at the same time with high flow exhaust cat, wish is not very probable.

No CEL seems to keep you green enough to be in Pesce of mind. You should stick to OEM cats.

 

As I said before. Akra do their job letting You know it could happen, what I said was, In my own experience, it is not very likely to happen with cars with high flow cats. I do not ignore it, and I dont really mind about a CEL beyond the annoying light On the dash and the fact You could be ignoring another error for having a Cel permanently.

How do you think the ex Moto GP pace Car BMW 1M solved this? Or the BMW M5 or BMW M6? They usted Akrapovic Evolution systems.

Or, did You see any CEL on a stock GT2? Guess who designed that and guess about the main Focus during that development.