John@Fabspeed

One of these days i'm going to have to sit down and thoroughly research carbon fiber wheels so they don't skeeve me out. Boggles my mind they can make them with the structural integrity necessary for safe use. Have a set in the shop now we are mocking up on our 570S, they are indeed ridiculously light haha

Churchill

No offense, but Fabspeed dyno results about Fabspeed products are not a reliable source of info. Fabspeed headers on a 993 make zero power -- this I've seen myself. It's hard to believe that Porsche designed headers on the 991S that are so restrictive that not only is there easy power to find at the top end, but across the entire RPM range. I have no dog in this fight and am happy to be wrong. But all of Porsche's header exhausts -- from 1965-1974, and starting again with the 993 -- pretty much cannot be improved upon with a stock motor.

Syringe

The IPD plenum and BMC air filter combination made a notable boost in power (along with AWE x-pipe) on my 991 with a 3.4L. Especially stronger from 3500-5000 rpm....right in streetable revs. Great sound, too!

I see the Akra is going on, and you have a 3.8 engine, but I think a reconsideration of the plenum might be worthwhile. It was not an easy install in my garage, but totally worth the effort.

John@Fabspeed

Well you can be certain that offense was taken as we stand behind our products fully, and have been in the performance industry developing these products for 25 years. If there was an issue with performance with one of our products I would have hoped someone reached out to us to review and resolve the situation. We have thousands of satisfied customers and authorized shops throughout the world that have received products exceeding their expectations of performance and sound. Performance shops worldwide, even Porsche dealerships sell our products to their clients because they know we are proven performers from their own testing, experience, and feedback.

Just in the interest of heading this topic off, I had posted third party dyno data confirming our own dynographs of the 991 Sport Headers in my previous post. I also mentioned the fellow member here on the forum that had his shop perform those tests if there were any doubts for you to reach out to. I assume you must not have seen that information.

Our results are most certainly a reliable source of data, as we have always had nothing but the best intentions to help the Porsche community maximize their driving experience. If we didn't and our data was not a reliable source, we would have no following and no clients. To be blunt, you are incorrect in your assumption Porsche did not leave power on the table with their cars. Not only are we accomplishing performance gains, but numerous other reputable aftermarket performance companies. It is a shame your poor previous experience has put you in this mindset. There is no doubt something out of the ordinary had occurred, because we have countless thrilled air-cooled owners running these products with no problems at all.

That all being said, I would like to make up for your experience at some point. My cell number is in my signature below, and I am very much open to taking whatever time is needed out of my day to listen to your experience and analyze where things may have gone array with that header install and testing. We can also chat in detail about where and how Porsche has left performance on the table on their vehicles so you can be fully educated on the topic. I also invite you to come by our facility any time, and i'll give you a behind the scenes personal tour of our product development process and fabrication.

Syringe

What doesn't seem to get mentioned on here often, - and is undoubtedly part of the reason why there's "performance left on the table," is that EPA sound emission regulations are tough for new vehicles to meet without some compromise.

Even though we get sniffed in Oregon now (in a couple of counties) when tags are renewed, they're not testing sound....yet. I think I'd probably still pass at idle with the AWE X-pipe/intake work I've done to the car, but certainly not at half-throttle under load. Of course, I love the sound, but others don't.

I commute and track a motorcycle, too, and sound regulations (basically not enforced) for bikes are lower than cars (here at least), and the CARB restrictions in CA are a bit ridiculous. Especially given most bikes, for weight savings and cooling reasons, have partly exposed engines. When I put a full Akrapovic exhaust on my ZX-6R track bike a couple of years ago, I gained a full 14 hp - and have the dyno to back that. Kawasaki is known for making good headers, too. (The cat went away with the stock exhaust). I cannot expect to run it at some racetracks (like Laguna Seca) without restricting it, although it's only about 5 db more than stock.

I can only think that improving flow if sound regulations are slightly bent, is going to add power that Porsche cannot put on the table because it has to satisfy sound emission regulations in order to sell new cars....

Just my over-articulated $0.02, but I'm not an engineer.

gbree

Agree with this 100%. I've seen multiple cars with Fabspeed products and they never fail to disappoint on a dynojet.

SDaddy

Very interested in hearing about progress with rear seat delete and the list of part numbers involved. There is another thread on this and one thing to consider is a version of the replacement rear center console says "GT3" on it. The R does not have any designation on it (from the one I saw in the showroom).

STG

Seems to me that headers with less restrictive cats would benefit any car. The higher flow cats and more so complete cat deletes are found on any track car for a reason.

MagicRat dug into this very deep and would trust his info and results. I know Fabspeed worked with him and went all out to work with him on his GTS.

Churchill

For exhausts, like intakes, bigger and less restrictive is not better. But smaller and more restrictive is also not better. The key is finding the size and design that maximizes the velocity of the intake and exhaust gasses.

008

Restriction over run is the key with intake and exhaust. Variable is the best but not always feasible. Usually longer tube headers without cats produce the best result of hp and torque when properly tuned.

John@Fabspeed

I appreciate your understand and kind words. We care very much about this community and are dedicated to the development of our products to meet our expectations.

R&D is the most important part of a product and is truly a science. I am confident in saying we have a wealth of knowledge under our roof to maximize the performance and sound of various platforms of Porsche, Ferrari, McLaren, Lamborghini, BMW, Aston Martin, Maserati, Range Rover, Bentley, Audi, etc.

Here is a little teaser of our most recent product development, our Long Tube Competition Race System for the 991 GT3/RS. Proven on the dyno multiple times with multiple cars, even on the street by our customer with a VBox. Links and video are below to reference.

https://rennlist.com/forums/991-gt3-...er-system.html

https://rennlist.com/forums/991-gt3-...or-gt3-rs.html

Johnny5Alive

Any news on this project?

PatrickC23

I didnt read through all the thread, but was curious, has anyone installed the R engine cover on a GTS? Was wondering if it even fit and how it'd look. Not doing it, just curious.

whoadude

anyone want to bite the bullet?

https://www.suncoastparts.com/product/PK911RGRILLE.html

PatrickC23

Ha - thats where I got the idea bc I was surfing their site looking for the GTS grill cover.

Actually, it would be a big gap for the brake light if u have a ducktail.