Best Exhaust for a 991.2 GT3
12-11-2017, 11:28 PM
#166
Drifting
in my opinion a big difference. Definitely more growl, louder, a lower bassy growl which is especially noticeable at lower rpms. I’d been struggling with this car, it just needed something....this bypass exhaust nailed it. I’ve been giggling all day driving around. I couldn’t say that yesterday, other then just happy to be shifting again.
12-11-2017, 11:42 PM
#168
Rennlist Member
Originally Posted by Jimmy-D
^ I may try a GRP in the Spring after Winter storage. I believe the tips are 100 mm which is perfect.
12-11-2017, 11:47 PM
#169
Rennlist Member
I will vouch for GRP centre bypass also.
I just had it installed on my 911R.
Only one word is needed to describe the sound.
EPIC
As a bonus, there is no droning from idle to redline.
The bypass saved 13+lbs for those that wonders. And no I don't know how much HP it freed up, don't care. 500HP is plenty enough, the nice sound more than make up even if it loses HP.
Oh, and since the factory valve still works, there is a 'quiet' mode. But in Sports mode, after 3500rpm when the valve opens, all hell breaks loose.
I just had it installed on my 911R.
Only one word is needed to describe the sound.
EPIC
As a bonus, there is no droning from idle to redline.
The bypass saved 13+lbs for those that wonders. And no I don't know how much HP it freed up, don't care. 500HP is plenty enough, the nice sound more than make up even if it loses HP.
Oh, and since the factory valve still works, there is a 'quiet' mode. But in Sports mode, after 3500rpm when the valve opens, all hell breaks loose.
12-12-2017, 12:31 AM
#170
12-12-2017, 12:34 AM
#171
Three Wheelin'
This has been beaten to death. The BBI/GR is different because rhe pipes connect like an X-pipe. GMG and Sharkwerks connect by a rear pipe. They so not sound the same. So yes, it is something new.
12-12-2017, 12:53 AM
#172
Rennlist Member
Originally Posted by drdonger
This has been beaten to death. The BBI/GR is different because rhe pipes connect like an X-pipe. GMG and Sharkwerks connect by a rear pipe. They so not sound the same. So yes, it is something new.
X-pipe? I think not. The sides that are X'd come from the same side of the motor. No vacuum there! They may be x'd, but don't expect any scavenging. The rear pipe on the GMG looks like a half-hazard Helmholtz chamber. No idea if it works. 100% sue the BBI and Rahal do not replicate an actual x-pipe. RSS offers a true X-pipe.
12-12-2017, 02:28 AM
#173
Three Wheelin'
Thank you for the info!
X-pipe? I think not. The sides that are X'd come from the same side of the motor. No vacuum there! They may be x'd, but don't expect any scavenging. The rear pipe on the GMG looks like a half-hazard Helmholtz chamber. No idea if it works. 100% sue the BBI and Rahal do not replicate an actual x-pipe. RSS offers a true X-pipe.
X-pipe? I think not. The sides that are X'd come from the same side of the motor. No vacuum there! They may be x'd, but don't expect any scavenging. The rear pipe on the GMG looks like a half-hazard Helmholtz chamber. No idea if it works. 100% sue the BBI and Rahal do not replicate an actual x-pipe. RSS offers a true X-pipe.
BBI/GR have a very similar design except the lst part of the tail pipes are separate.
12-12-2017, 03:04 AM
#174
I currently have a center muffler bypass made by Soul performance. In terms of value - you really can't beat it. I didn't want to spend too much on a center muffler bypass since my main objective is to get aftermarket headers. Soul is a relatively newer company and as such, they don't yet have any other modifications for the 991 GT3. I think there's a side muffler bypass in the works, and maybe headers if there's enough demand.
Anywho - I'm happy with mine for now
the sound is great and it feels like it really woke up the GT3 in terms of volume. Lower in the RPM - you can't really hear much except at idle. 4k+/higher in the RPM - sounds great. For the price, it's very difficult to beat, especially in tandem with various tip options that they offer.
Here's a POV video I made with GoPro audio after recording a cold start. It isn't the best audio quality, but you get a decent idea of how it sounds inside the cabin:
And here's a clip that Soul recorded when I visited them:
Truth be told - I'm after some more volume and a more "exotic" sound. Straight piping the exhaust system after the cats will make the car drone pretty badly from what I gather, but I may do it for fun and then just put the OEM side mufflers back if it's that bad. After the winter season is over, I'm looking to install Dundon's race headers along with their muffler. After a lengthy discussion with Jamie and a quick glance on these forums to gauge Dundon's reputation, it's evident that their product is very well engineered and they stand by it.
Anywho - I'm happy with mine for now
the sound is great and it feels like it really woke up the GT3 in terms of volume. Lower in the RPM - you can't really hear much except at idle. 4k+/higher in the RPM - sounds great. For the price, it's very difficult to beat, especially in tandem with various tip options that they offer.Here's a POV video I made with GoPro audio after recording a cold start. It isn't the best audio quality, but you get a decent idea of how it sounds inside the cabin:
And here's a clip that Soul recorded when I visited them:
Truth be told - I'm after some more volume and a more "exotic" sound. Straight piping the exhaust system after the cats will make the car drone pretty badly from what I gather, but I may do it for fun and then just put the OEM side mufflers back if it's that bad. After the winter season is over, I'm looking to install Dundon's race headers along with their muffler. After a lengthy discussion with Jamie and a quick glance on these forums to gauge Dundon's reputation, it's evident that their product is very well engineered and they stand by it.
12-12-2017, 04:21 AM
#175
Heres a little clip of my car with Dundon Headers + Side Cat Delete..
https://drive.google.com/file/d/1Bv0...ew?usp=sharing
https://drive.google.com/file/d/1Bv0...ew?usp=sharing
12-12-2017, 07:05 AM
#176
Three Wheelin'
I’ve had the Dundon race headers on my 2014 for a couple years, the sound is hard to describe adaquately! Dundon service is beyond impeccable.
The only downside to the race headers other than a lot of great sound (too loud for wife/dinner but no drone) is the rich smell of fuel due to cat removal. It’s bad enough that I am trading my race headers for street version with cats (also Dundon, they are so solid I would never even consider a different vendor for exhaust).
The only downside to the race headers other than a lot of great sound (too loud for wife/dinner but no drone) is the rich smell of fuel due to cat removal. It’s bad enough that I am trading my race headers for street version with cats (also Dundon, they are so solid I would never even consider a different vendor for exhaust).
12-12-2017, 10:12 AM
#177
Race Car
Heres a little clip of my car with Dundon Headers + Side Cat Delete..
https://drive.google.com/file/d/1Bv0...ew?usp=sharing
https://drive.google.com/file/d/1Bv0...ew?usp=sharing
I just think there is no comparison between a full system and a center section only. You want full race car sound get a side muffler delete system. You want something that in low RPM sounds stock and you can still have a conversation but when the time is right rev her up and sound killer then you need to go with just a center section.
12-12-2017, 11:11 AM
#178
Three Wheelin'
I still think IPE catback is still the best way to go. You get side deletes and a valved rear exhaust. This lets you essentially turn the exhaust off when you want it quiet, just like oem.The titanium system is also light and removes heat from the rear tires. The center section has an x-pipe design for that incredible high pitched sound and their quality has gotten a lot better. I will be a guinea pig and test out their titanium carback, when my car comes. I’ll weigh it against the stock and also try to get a dyno done. I have attached a couple of pics. You can see the welds and build quality of the new titanium exhausts are way better than the initial ones.
12-12-2017, 11:18 AM
#179
Race Director
I still think IPE catback is still the best way to go. You get side deletes and a valved rear exhaust. This lets you essentially turn the exhaust off when you want it quiet, just like oem.The titanium system is also light and removes heat from the rear tires. The center section has an x-pipe design for that incredible high pitched sound and their quality has gotten a lot better. I will be a guinea pig and test out their titanium carback, when my car comes. I’ll weigh it against the stock and also try to get a dyno done. I have attached a couple of pics. You can see the welds and build quality of the new titanium exhausts are way better than the initial ones.
12-12-2017, 11:28 AM
#180
I actually don't understand why most install a center muffler bypass(which they are all about the same design/quality) over a long tube header system with valved SMBP. Is it the price difference only?, because the LTH setup makes more power, reduces a lot of weight, and eliminates a lot of heat near the tires/engine area, plus sounds better(imo) or about the same/similar sound if you go with the catted systems. The center muffler delete systems might make a little(barely any) more power, but in reality the only thing it does it make the engine sound better. For me, I would rather make more power and sound good than just sound good, especially for the money we are spending on any of these settups. Just my opinion but was curious as why most choose the center muffler bypass over other systems.