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I am looking to get a little more mid-range power out of my 997.1 GT3. The car has BBi side-bypass pipes with stock center exhaust and LWFW.
Would upgrading the headers with perhaps 200 cel cats be a worthwhile improvement that you can actually feel? If so, any brand of headers to seek out, and stay away from? I've seen a lot of mentions of products from Fabspeed, AWE.. but don't know anything about them. Would I need to change anything else, like engine mapping?
Any help and advice is greatly appreciated!
Originally Posted by Spyerx
Hahah. Well. He said power. If he said awesome sound I'd fully support the spend! Hahha
Originally Posted by zaitsev
the side bypass exhaust produces awesome sound as it is (get compliments on it from the local PD all day long). I'm planning on installing stock cats to pass emissions first, but then...
The sound is already there, and if it's an added bonus, I'm all about it.. but I wanted a little more kick when not racing from 5500 to redline.
If you want to feel a solid improvement in power, it's all in the headers/software. And speaking of headers, we just finished up these for the 997.1 GT3/RS
Originally Posted by dak996
Hi every one .. got fabspeed sport headers cat less .. i have some issues in sensors any help
Shoot me over a PM about the sensors, i'll see what I can do to help.
Fabspeed,
Will these new headers work (optimally) on the 997.2 GT3? If so, do you have any pricing or release date info?
Yes on the 997.1 and 997.2 GT3/RS, and I actually test fit them on a 991 GT3 Cup Car as well (pre-2017) that utilizes the 997 GT3 engine. They are fixtured and already have two sets sold and on the way to New Zealand. We are quite far behind on updating on website and creating the "official" product release, but they are $5500 for a set and come with our Valved Side Muffler Bypass Pipes as a package.
We do have a catted version with shorter primary tubing for fitting high flow HJS cats while maintaining bolt-on capability with the remainder of the factory exhaust system.
GMG is my primary choice. I have on mine and love them.
Thank you for the vote of confidence.
Originally Posted by zaitsev
Would upgrading the headers with perhaps 200 cel cats be a worthwhile improvement that you can actually feel? If so, any brand of headers to seek out, and stay away from? I've seen a lot of mentions of products from Fabspeed, AWE.. but don't know anything about them. Would I need to change anything else, like engine mapping?
Any help and advice is greatly appreciated!
To partially echo what others have said, yes you will get an increase in tangible power. It is enough for you to feel, but it won't be a "game-changer" difference. As also noted, the tune is a great touch, if only to help smooth out the ignition curve.
Do understand that if you already have side bypasses, the exhaust volume increase a noticeable amount with headers.
Here are our GMG WC-Sport Headers that feature 200-cell HJS cats. Note the longer primaries lengths which help increase the mid-range powerband (while retaining the convenience/benefits of running cats). This is the product link, but if you have any more questions just let me know.
Porsche | Audi | Ferrari | Lamborghini | McLaren
Performance Tuning | Motorsport | Factory Service
Pirelli World Challege Race Team GT/GTA/GTS/TC
Pirelli GT3 Cup Trophy USA
Porsche Motorsport — Audi Sport Customer Racing — Lamborghini Super Trofeo Series
To partially echo what others have said, yes you will get an increase in tangible power. It is enough for you to feel, but it won't be a "game-changer" difference. As also noted, the tune is a great touch, if only to help smooth out the ignition curve.
Do understand that if you already have side bypasses, the exhaust volume increase a noticeable amount with headers.
Here are our GMG WC-Sport Headers that feature 200-cell HJS cats. Note the longer primaries lengths which help increase the mid-range powerband (while retaining the convenience/benefits of running cats). This is the product link, but if you have any more questions just let me know.
All the best,
Andrew
These + the GMG center bypass are what i've got on mine. Felt a decent increase in midrange power, but I also have a 3.8 motor as well. Here's some videos to give context on sound:
I got a pair of gmg headers, i had them ported, rewelded. I have to be honest, and don't mean to offend anyone. The gap between the heading tubing and the flange was pretty poor for airflow on my gmg headers. I hope gmg has improved that.
that said, the headers are catless + w/ my center section (x pipe) i netted a gain of .7 secs ( have hard data on this) from 40-110 mph, iirc. Find a post i made a few months back. The car sounds glorious. If any of you were at mooty's track day earlier this month, you probably heard it.
IF not, i can see if i can get video. 0 drone. no feel of loss tq in mid-range ( that could be due to x merge)
05-31-2017, 08:40 PM
