991 gt3 exhaust bypass

[Melvynr]

CorrosionInhibitor said:

If anyones after a 991 gt3 / gt3rs rear bypass I can do them a blinding deal on a unsilenced rear bypass, 4” black tips and also silenced tips with downturns.....

Edited by CorrosionInhibitor on Tuesday 18th February 16:42

What black tips have you got for sale buddy

[Melvynr]

CorrosionInhibitor said:

Brooke. Pretty much brand new, pm me if you want

Thanks.
Car is in next Tuesday for a new side muffler, just waiting to see if that's where the exhaust vibration is coming from. Will give you a shout then.

Is there a PM function on here, or is it by email, couldn't see a PM one.

[paul mc]

Is it a bypass for a 997 you are looking for? If so I have one for sale.
It is a Hayward and Scott.

[D.no]

Melvynr said:

Thanks.
Car is in next Tuesday for a new side muffler, just waiting to see if that's where the exhaust vibration is coming from. Will give you a shout then.

Is there a PM function on here, or is it by email, couldn't see a PM one.

Hi Melvyn,

Let us know how you get on..

Did you watch the bypass being fitted? Just wondered whether there was any hammering/tapping involved with the removal of the centre muffler and/or fitting of the bypass. Just a thought that it could be a cat' brick perhaps, as they can "buzz" if they're loose. I'm also led to believe that any difference in flow between the banks can lead to strange harmonics. Do you have a definitive rattle that can be reproduced by gentle tapping or shaking, or does the noise only occur at certain rpm/loads?

[imycool]

CorrosionInhibitor said:

Brooke. Pretty much brand new, pm me if you want

@corrosioninhibitor - do u have still have the RS day tickets available ? i'v tried sending a pm, but not sure its going through

[Double gauche]

ill have it if its still going

[Melvynr]

D.no said:

Hi Melvyn,

Let us know how you get on..

Did you watch the bypass being fitted? Just wondered whether there was any hammering/tapping involved with the removal of the centre muffler and/or fitting of the bypass. Just a thought that it could be a cat' brick perhaps, as they can "buzz" if they're loose. I'm also led to believe that any difference in flow between the banks can lead to strange harmonics. Do you have a definitive rattle that can be reproduced by gentle tapping or shaking, or does the noise only occur at certain rpm/loads?

Hi buddy

I wasn't there when the bypass was fitted although the guy said it went on straight forward, have got the OEM tips on the bypass and if you tap them you do get a vibration, stuffed my slippers up between them and bumper which stops it. It's definitely a temperature vibration coming from the right-hand side of the vehicle, once up to temp, I put a bar between the CAT and bottom of the muffler and press down slightly so it lifts the muffler, it stops. I slackened off the clamp and spun it around a piece, but it still does it.
Tech took a sound file and sent it off to Porsche who came back and said, although it would be unusual for the muffler to be broken, they agreed it was worth changing. So in on Tuesday to get it fitted.
I took a vid myself of the sound below.

https://youtu.be/DB_M9Yfud9g?list=WL

[spreadselbow]

anyone after a sharkwerks bypass? Decided I am not going to fit it before the replacement car arrives. Not listed anywhere else currently

[AllisterT]

paul mc said:

Is it a bypass for a 997 you are looking for? If so I have one for sale.
It is a Hayward and Scott.

Have you still got this for sale ?

[SpyderT]

I'm considering a JCR centre bypass but I've more of an issue with sound below 4000rpm and wondered if anyone here has fitted the car graphics valve opening system? Also, for an extended warranty would this have to be removed?

Any thoughts on doing a centre bypass would be much appreciated too and have people just left the tips as stock?

[AJB88]

SpyderT said:

Also, for an extended warranty would this have to be removed?

100%, Porsche decline warranty extensions for fitting grilles to the front of the car no way they would allow this!

[Melvynr]

SpyderT said:

I'm considering a JCR centre bypass but I've more of an issue with sound below 4000rpm and wondered if anyone here has fitted the car graphics valve opening system? Also, for an extended warranty would this have to be removed?

Any thoughts on doing a centre bypass would be much appreciated too and have people just left the tips as stock?

Wouldnt bother buying a valve controller, PSE on the GT3 is a con as just works on tick over for more volume. Have had the valves open [tubes disconnected] and its a lot deeper sound but still don't get the volume before 3k revs.

As far as warranty goes, if you have a good relationship with your dealer I am sure he will close his eyes as mine did getting one of the side mufflers renewed under warranty with the bypass in place.

[Melvynr]

Melvynr said:

Wouldnt bother buying a valve controller, PSE on the GT3 is a con as just works on tick over for more volume. Have had the valves open [tubes disconnected] and its a lot deeper sound but still don't get the volume before 3k revs.

As far as warranty goes, if you have a good relationship with your dealer I am sure he will close his eyes as mine did getting one of the side mufflers renewed under warranty with the bypass in place.

I have the JCR centre bypass and its very good, also bought the megaphone tips off one of the guys on here which has put the icing on the cake adding 20 per cent more volume and looks fab as the tips turn blue.

[Porsche911R]

SpyderT said:

I'm considering a JCR centre bypass but I've more of an issue with sound below 4000rpm and wondered if anyone here has fitted the car graphics valve opening system? Also, for an extended warranty would this have to be removed?

Any thoughts on doing a centre bypass would be much appreciated too and have people just left the tips as stock?

it's mega bit of kit the JCR bypass, easy to fit, works with oem tips, ups the volume, keeps 2 level of sound. 11lbs weight saving from the rear.

I am thinking going to the next level up now, but still JCR, so could have one for sale if serious. PM me.

[Melvynr]

Porsche911R said:

it's mega bit of kit the JCR bypass, easy to fit, works with oem tips, ups the volume, keeps 2 level of sound. 11lbs weight saving from the rear.

I am thinking going to the next level up now, but still JCR, so could have one for sale if serious. PM me.

Do elaborate.

[Cheib]

Melvynr said:

Porsche911R said:

it's mega bit of kit the JCR bypass, easy to fit, works with oem tips, ups the volume, keeps 2 level of sound. 11lbs weight saving from the rear.

I am thinking going to the next level up now, but still JCR, so could have one for sale if serious. PM me.

Do elaborate.

These RPM videos with Mr JCR and Tim Harvey are excellent for explaining the ludicrous amount of options JCR offer !

https://youtu.be/8RRiM4nc6bY

https://youtu.be/gTlo1IGg-4Y

[Melvynr]

Cheib said:

These RPM videos with Mr JCR and Tim Harvey are excellent for explaining the ludicrous amount of options JCR offer !

https://youtu.be/8RRiM4nc6bY

https://youtu.be/gTlo1IGg-4Y

Brilliant, and good insight.£2695 plus VAT, I take it that is for the pair of valved side mufflers. His workmanship is on a par with Akrapovic.

Incidentally, one side muffler from Porsche is 2.6k.

[Batster3]

Anyone here gone with Manthey side delete with cup pipes?

[Sinkygolf]

If you have the patience go and watch Obsessed Garage on YouTube. He must have tried and tested all combinations. He reckoned the best, cheapest and simplest solution was an x pipe rear muffler delete.

I went with a Milltek, same as the JCR.

[gixermark]

did anyone manage to find a bypass pipe that OPC's were 'ok' with regarding their warranty ? or is it simply a no from them regardless ??