SharkWerks 991 GT3 Bypass
Discussion
Thinking of fitting the SharkWerks Bypass onto my 991 GT3 as , in truth , the sound of the exhaust , is a tad tame. I wanted to know if anyone could recommend someone brilliant in the Midlands to fit and also to ask those of you who have taken the plunge , is the car without the sports exhaust button on as quiet as at was pre mod? Really looking for the flexibility of tame and quiet (ish) when the button is off vs. raw & loud when on - best of both worlds - Cheers 
Edited by RSVP911 on Monday 17th November 22:27
hopeydaze said:
I was meandering along in the middle lane of the M4 this morning with a 991 GT3 in the outside lane next to me. Gap opened in the traffic and he/she nailed it. Very impressive stuff, engine dropped down two gears (I assume as that's what it sounded like), the bonnet seemed to jump up as weight moved to the back.
Point of the post is that the noise, at least when behind the car, was out of this world. Assuming it was a standard exhaust...would you really want it any louder. I remembered the 911 reg. although I had better not say in public.
My 996 GT3 doesn't sound or perform anything like that.
I think the noise is a treat if you are outside the car , but a bit tame at lower revs inside - mine does sound great on occasion , but it's rare and you have to have the right set of circumstances for it to happen. I guess bottom line is I much prefer the noise and theatre of my 991 C2S with ,what is probably (?) a synthetic SE than the GT3 - & that just can't be right - real shame , as other than that the car is awesome in every way Point of the post is that the noise, at least when behind the car, was out of this world. Assuming it was a standard exhaust...would you really want it any louder. I remembered the 911 reg. although I had better not say in public.
My 996 GT3 doesn't sound or perform anything like that.
Magic919 said:
You could try Chris at ABP http://www.abpmotorsport.co.uk/abp-homepage Bit north of the Midlands.
He imported mine (997 Carrera) and offered to fit. He is happy to import for 991 GT3, he said.
Cheers , this is who SharkWerks suggested , just wasn't too sure : looking at the web site as it looked like a big , non specialist , high volume type of place : nothing wrong with that , just not sure I wanted to risk it without knowing anything about it - assume you were happy with service , etc ? - Cheers He imported mine (997 Carrera) and offered to fit. He is happy to import for 991 GT3, he said.
mhh said:
I bought one, loved it, but then discovered on a trip that it has a resonance vibration at 3,000 rpm (about the open road speed limit where I live) so I removed it. It sounded great above 3,500 but this narrow band of harshness spoiled the experience for me. With the old exhaust back on, the vibration has gone. And my Boxster S (with PSE) sounds better than my GT3. 
Most of the Sharkwerks sound improvement happens above 3,500 rpm. The idle is a bit bassier but it remains quiet at low revs - a bit louder but not much.
Thanks for the feedback , other than the resonance issue , this sounds perfect - not too loud when pottering , but fun when moving at pace - did the resonance vary with the SE button on/ off ? Most of the Sharkwerks sound improvement happens above 3,500 rpm. The idle is a bit bassier but it remains quiet at low revs - a bit louder but not much.
Edited by mhh on Tuesday 18th November 19:36
Was it easy to reverse and did the reversal work ok - IE back to square 1 , no problems ?
Also were you not tempted to try another in case the first one was faulty ?
Really sorry to bombard you with questions
hondansx said:
It's that final 1000rpm that it comes into its own recently. I'm starting to think exhaust mods for the GT3 are just for showing off (i.e. for the benefit of people outside the car!).
I hear what you say , but it's really not easy (responsible) to drive the GT3 in the really high rev bands on normal roads - hence the desire for the noise lower down the range - I agree, there is no real reason for wanting this other than the fact it's smile inducing - nothing more complex than that Edited by RSVP911 on Tuesday 18th November 21:29
Scott Parker said:
My biggest disappointment compared to my 991 CS is that you don't get pops and crackles with the GT3. Pops and crackles are added through the engine map so would be nice if they had a retrofit for the GT3
Hi Scott , what do you mean re engine map ? Are you saying that at certain revs the exhaust is forced to perform in certain ways - not sure I really understand the whole synthetic exhaust thing ? chrisABP said:
I have a 997.2 GTS and was so disappointed with the OE Porsche Sports system noise so after a lot of research I decided on the Sharkwerks upgrade.
As a company we import a lot of product from the US so approached Sharkwerks and they were really positive about supplying me a system (unlike a lot of US companies who think the World stops at the East and West coast!) so I arranged UPS to collect and took the plunge. On the GTS it's a great upgrade and we have subsequently imported and sold 10 x 997.2 exhaust upgrades which have all been sold in less than a month! We have another 5 on order currently being made.
We are able to supply the 991 GT3 system but I have no direct experience of the sound levels etc, fitment looks to be a simple switchover and easier than the 997.2 GTS arrangement. Price wise we will be able to save you money as opposed to buying directly and we can install (based in Cheshire just off M6 J16) or ship out mail order. Please PM or email me on chris@abpmotorsport.co.uk
Apologies for our out of date website but for up to date info just google ABP 'Motorcodes' garage of the year or CAT garage of the year which we won for four consecutive years!
Hope this helps, Chris
Thanks Chris - have sent you a pm As a company we import a lot of product from the US so approached Sharkwerks and they were really positive about supplying me a system (unlike a lot of US companies who think the World stops at the East and West coast!) so I arranged UPS to collect and took the plunge. On the GTS it's a great upgrade and we have subsequently imported and sold 10 x 997.2 exhaust upgrades which have all been sold in less than a month! We have another 5 on order currently being made.
We are able to supply the 991 GT3 system but I have no direct experience of the sound levels etc, fitment looks to be a simple switchover and easier than the 997.2 GTS arrangement. Price wise we will be able to save you money as opposed to buying directly and we can install (based in Cheshire just off M6 J16) or ship out mail order. Please PM or email me on chris@abpmotorsport.co.uk
Apologies for our out of date website but for up to date info just google ABP 'Motorcodes' garage of the year or CAT garage of the year which we won for four consecutive years!
Hope this helps, Chris
Scott Parker said:
Going back a few years when I had a WRX, my mapper could play around with fueling/timing on the overrun to produces pops and bangs. Obviously that was on a Turbo car but I would of thought that makes no difference. Hence the 991 having a crackling exhaust on overrun especially when PSE is on, im not sure but I don't think previous Carrera's had this. I read/saw somewhere that the crackles of the 991 where added "emotion" along with that poxy sound composer that I stuffed with a bit of foam as it was a whiney noise
Yep 997 SE was rubbish . The SE on my 991 C2S although "synthetic" was great - much better than the GT3 IMHO (apologies to the purists) It just can't be right that the first thing I do on start up in a GT3 is hit the SE button Edited by RSVP911 on Wednesday 19th November 21:27
BlackGT3 said:
I have a Sharkwerks MB filled to my 997.1 GT3. Very happy with it and i've not experienced the issues mentioned by others in this thread.
Cheers thanks for letting me know - sure it will be fine otherwise there would be lots of on line chatter about issues - very hard to find this though RushSpeed said:
Try these clips for size from friends across the pond:
https://www.youtube.com/watch?v=I0ANEhlSpSk&fe...
https://www.youtube.com/watch?v=9liXAevfMtA&fe...
Had mine since August and certainly no regrets. The OEM exhaust too “normal” for my liking - do what you feel in this instance, all emotional but at least it can be reversed if not to your liking. A 991 GT3 needs to be seen and certainly heard!!
Yep - very excited , my only gripe with the GT3 - otherwise awesome in every way. The sound in the video is intoxicating https://www.youtube.com/watch?v=I0ANEhlSpSk&fe...
https://www.youtube.com/watch?v=9liXAevfMtA&fe...
Had mine since August and certainly no regrets. The OEM exhaust too “normal” for my liking - do what you feel in this instance, all emotional but at least it can be reversed if not to your liking. A 991 GT3 needs to be seen and certainly heard!!
Scott Parker said:
Whats the supply price on these?
Can't say total price - you would need to speak to Chris at ABP , however what I can tell you is whatever it is you will need to add on my commission , which is very costly. This is down to Chris hijacking my thread for ABP marketing purposes - only kidding Chris , you carry on , it's a master stroke , a stroke of genius . Joking apart , I'm yet to have it fitted but the service so far has been really excellent - roll on Thursday It's very late so I'll be brief - Fistly Chris and his team - top class - highly recommend them - the only hitch was the delayed start caused by the stupid customer not getting there on time - Chris re jigged his day and started on my car as soon as I arrived - all done and dusted in an hour and a bit - exhaust now sounds as it should on a GT3 , but doesn't sound excessive from inside the cabin , especially with the SE off - however with SE on , sounds amazing when revving with the door open - just awesome
Highly recommend ABP - thanks Chris once more for your help and support through this simple process.
P.S no issue what so ever with the dreaded resonance
Highly recommend ABP - thanks Chris once more for your help and support through this simple process.
P.S no issue what so ever with the dreaded resonance
Edited by RSVP911 on Friday 19th December 08:30
RSVP911 said:
C. Grimsley said:
Have you got any recordings of what it sounds like now?
Carl
Best videos are in a post below : RushSpeed on Dec 14 Th.Carl
Basically , it now sounds like a full on raspy boxer engine - I don't want to become an exhaust bore (too late - sorry) but I know how fanatical a lot of GT3 owners are and in my view this is the cherry on an amazing cake ! I just can't believe that the engineers wouldn't make the car sound like this if worldwide regs allowed it - it simply sounds "right" . I guess all the middle muffler does is just that , takes away the pure sound of the exhaust : I'm posting this as I love my GT3 - best car I've ever had and I know lots of other owners feel the same way and I feel like I've added something that has unbelievably made what I thought couldn't be improved , even better - it really adds value to the emotional experience of driving the car . I guess the only way to get sound like this without the SW is to drive the card very hard , which just isn't possible on most roads , most of the time - the SW , gives you this experience much lower down the rev range.
I'll shut up now
Edited by RSVP911 on Sunday 21st December 21:48
Edited by RSVP911 on Sunday 21st December 21:50
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