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Transform your GT4 RS’s exhaust note and ADD significant power versus the stock GT4 RS rear exhaust. FABSPEED's proprietary X-pipe design gives the GT4 RS the same high pitched wail as the GT3 and it’s totally plug-and-play with the factory exhaust valve system so you can quiet down the exhaust using the factory PSE button.
Our design process started with 3D scanning the entire OEM exhaust system using our CREAFORM 700 Handscan so that we could make a complete Solidworks 3D model of the exhaust. We then designed the exhaust and fixtures using that model so that the exhaust fit perfectly to OEM standards. After multiple revisions for sound and dyno testing we decided to use our signature investment cast X-Pipe to tie the FLAT 6 engine's two separate Right & Left cylinder banks together for exhaust scavenging and to defeat resonance. We also went to great lengths to eliminate drone on this exhaust, utilizing helmholtz resonator technology to cancel out unwanted frequencies that “drone.” Porsche GT4RS and SPYDER RS owners and shops- the FABSPEED GT4RS rear valvetronic is 100% guaranteed to be the best sounding, most reliable and most powerful system available.
SOUND:
Wondering why your GT4 RS doesn’t have the same high pitched scream of the GT3? Our Valvetronic X-Pipe is the solution! Our X-pipe design merges the two exhaust banks for an intoxicating 9000 RPM symphony. Even though this system will net you a significant increase in volume over stock, the valved design allows you to control the volume with the factory PSE (Porsche Sport Exhaust) button, quieting the exhaust note for a drone free driving experience.
POWER:
Comparing our development car equipped with our Over Axle Link Pipes, our Vavled X-Pipe added +7.5HP (+6.2 HP at the rear wheels) at 8100 RPM and +11 ft/lbs of TQ at 3500 RPM. WE designed and DYNO developed multiple systems BEFORE we settled on the very best system in terms of sound and horsepower. Trust Fabspeed with over 30 years or experience!
FEATURES:
We're currently working to get more reviews for this product. In the meantime, please take a look at our reviews from other platforms.
Been a regular customer for a while now and I must say that they're the best at what they do! Bought a number of upgrades for my 991.1 911 Turbo from Scott and absolutely love the extra power and sounds! Top notch quality and service, would recommend to anyone looking to upgrade their car at any level of performance.
Couldn't be happier. I wanted to add a little power to my Porsche 911 Carrera S (997.1) but didn't want check engine lights or obnoxious sound. I worked with Jason and ended up getting a GT3 throttle body and an IPD plenum with a BMC air filter and the famous Fabspeed Sport exhaust. I seriously couldn't be happier. Talk about bang for your buck! It's a whole new car. Everything works together perfectly. No torque loss at all, in fact, I found some. Mid range is more alive and she just doesn't stop pulling now. The sounds is pretty much the same at low RPMs but my God when you jump on it, it sounds fantastic. No highway drone at all. I was considering the x-pipe cat delete but Jason explained that Porsches, especially naturally aspirated (non turbo) like a little back pressure and if I was not looking for too aggressive sound I should stick with what he suggested. He knows his stuff because the car is now exactly everything I had hoped for. Best car money I have ever spent.
I had heard great things about Fabspeed from others in the industry but my expectations were definitely exceeded with this project. The team at Fabspeed went above and beyond when developing and building the exhaust system for our NSX. With the pictures and video commentary, they made us feel like we were a part of the action and that isn’t an easy to do when you are 800kms away and in another country. I know that there were many skilled hands that were involved with making this project come to life and I would like to extend our thanks to the entire team. Moreover, I’d like to take a minute to emphasize how much I appreciated having Alec quarterback this engagement. He was a key part in making this happen and was patient, professional, and extremely responsive at all hours of the day/night. The NSX was greatly missed while it was gone but it came back with a new set of lungs and the sound is much more fitting of a car in its class. We are already considering working with them on another project and I would highly recommend them.
Very special thank you to DJ at Fabspeed. DJ answered my call late in the business day. We chatted about exhaust options available for my air cooled Porsche. He was very patient and knowledgeable. I told him I'd call the next day to follow up as I wanted to do more research on their products. I call the next day, speak to DJ, and settle on several performance parts for my Porsche. Best part, all items were in stock and able to be picked up since I'm local to their shop. I arrive at the shop at the agreed upon time. Items were already packaged and ready for pick up. The cherry on top was an offer from DJ to tour the shop and see "where the magic happens." I really appreciated this and enjoyed hearing about how Fabspeed started and where it's headed. Now that I'm part of their community, I'm looking forward to attending their open houses. I will be back in the future. Fabspeed is more than a "shop." They want to build lasting relationships with their clients while remaining on the cutting edge of product development. Kudos to the entire team.
I have been using Fabspeed products in my cars. I've tried different things, Resonator bypass X-Pipe, Sports headers and blankets and others on my Ferrari, Audi, Porsche, Maserati, etc.... They are reliable as advertised and have a great customer supporting system available everywhere. I have a great confidence in their products and will continue to use them in future... A reliable company that really follows up with you.
