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Just got done spending 300 glorious miles with the Gt420 package. The sound is like an F1 car on the top end. My other cars including my V12 F12 sound tame.
Unfortunately, I live in a super quiet neighborhood and when I get home with a big smile on my face, my wife gives me the stink eye.
Therefore, I need to sell the exhaust and put the PSE back on. I'm keeping my headers.
If anyone is interested in buying my Fabspeed Valvetronic please PM me.
Retail price on the Fabspeed site is $3,295.
I will part with it for $2,500 including free shipping.
Mine has the carbon fiber tips.
Btw, John Gaydos at Fabspeed has been unbelievable with customer service. I will definitely buy Fabspeed again.

Here's a copy and paste description from the Fabspeed site.
"Fabspeed's Valvetronic Exhaust System is the ultimate catback setup for the ultimate streetable track car.

Fabspeed's Valvetronic Exhaust System is the ultimate catback setup for the ultimate streetable track car.
The Fabspeed Valvetronic Exhaust is finished off with premium carbon fiber shrouded tips which fit the rear bumper of the GT4 like a finely tailored suit.
Our system comes equipped with 4" authentic Carbon Fiber tips with 2.5" inlets.
Fabspeed's Valvetronic Exhaust System installed.
The GT4 Valvetronic Exhaust is controlled by the factory exhaust valve button. Two unique exhaust tones in system, the choice is yours at any time.
Comparison of the Fabspeed Valvetronic Exhaust with the factory exhaust system.
We're happy to offer a new alternative tip option for our Valvetronic Exhaust System. Each set of Single-Wall Tips is hand built out of stainless steel and hand finished with pride at Fabspeed Motorsport.
Another look at our brushed Single-Wall Tips, an optional upgrade for the GT4 Valvetronic Exhaust
You can also opt for a full polish finish for the GT4 Single-Wall Tips
Fabspeed's Brushed Single-Wall Tips installed on a Porsche Cayman GT4
Fabspeed's Brushed Single-Wall Tips installed on a Porsche Cayman GT4
We're proud to offer a premium exhaust solution for the Porsche Cayman GT4. Our Valvetronic Exhaust offers two distinct tones depending on valve position: mild and wild.
Fabspeed's Carbon Fiber tips peering out from the bumper of our development GT4
Fabspeed's Valvetronic Exhaust System paired with Sport Headers provides significantly better performance during street acceleration
Fabspeed's Valvetronic Exhaust System paired with Race Headers proves significantly better performance during street acceleration
Porsche Cayman GT4 Valvetronic Exhaust System

Fabspeed's Valvetronic Exhaust System is the ultimate catback setup for the ultimate streetable track car.
* Select Tip Finish:

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Porsche Cayman GT4 Slip-On Turndown Tips
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Product Details:
Fabspeed's Valvetronic Exhaust System is the ultimate catback setup for the ultimate streetable track car.

SOUND: We're proud to offer a premium exhaust solution for the Porsche Cayman GT4. Our Valvetronic Exhaust offers two distinct tones depending on valve position: mild and wild. It was important to retain civility around town with valves closed, mission accomplished. You'll be able to enter your neighborhood after a midnight joyride without having to explain yourself at the next HOA meeting. Open the valves, and you'll be treated to a glorious roar befitting of the GT4. Burbles and backfires erupt in abundance, and downshifts summon a bark that will make all eyes and ears around focus on you. We're not exagerating. This system will put an ear-to-ear smile on the most miserly of faces.

POWER: When combined with Fabspeed's Race Headers, our Valvetronic Exhaust System allows you to push 375 whp out of your GT4! Even with Sport Headers coming in at 371 whp, the gains in power are as impressive as the sound. The Fabspeed exhaust suite completely eliminates the torque dip in the 3500 RPM range and offers power gains all the way through redline. The increase in low end power will make a great difference in street driveability with the long gearing of the GT4.

FINISH: Full polished T304L stainless steel, beautifully welded together and finished off with premium carbon fiber shrouded tips which fit the rear bumper of the GT4 like a finely tailored suit.

FEATURES:

Fits all Porsche 981 Cayman GT4 / 981 Boxster Spyder vehicles (2015+)
Choose between real matte Carbon Fiber tips or Single Wall Tips that are made in house for a racecar look
Weighs 7lbs less than the factory rear muffler system.
Constructed from 14-16ga T304L stainless steel tubing for maximum power and durability
Direct bolt-on installation; no cutting or welding required
All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty
Product Reviews
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God of Thunder! 5 Star Review
Posted by David on 28th Dec 2015

I recently installed the Fabspeed Race Headers and Valvetronic Exhaust System on my Porsche GT4...or should I say, I recently came face to face with The God of Thunder. For me, the sound of a car is nearly paramount in the car experience. The GT4 with this Fabspeed setup is better than anything I have ever heard. Even beats my favorites of a screaming Ferrari V12, the Lexus LFA, the Porsche Carrera GT, and the
C7 LeMans Corvette. I would take this over any of those...and I don't say that lightly.

The setup I chose is not for the faint of heart. 7500 rpms with open windows in a tunnel would make Zeus himself cower. Kudos to Fabspeed and Porsche for attaining automotive perfection."

Ddesimone17

I have Kline manifolds , ipd/tb and Cobb
Off the shelf mapping is fine there is not as much dialing in on NA
Cars
Im friends w Mitch from Cobb , we did some datalogs after I uploaded a new map
He checked and said the car was dialed in . Then did a dyno session to confirm and yes mitch was spot on

legin

Thanks thats what I was hoping would be the case. i may go cargraphic as they are my local supplier and about the same price as fabspeed once landed so hopefully near enough as makes no difference.

Ddesimone17

Cargraphic are an excellent choice , hit up Sam by design for Cobb and ipd goodies he will take good care of you
And then lookout people will be asking you why you have a perm a grin !
Cheers

Ddesimone17

Sound clip

John@Fabspeed

Unfortunately the long answer is that the 981 generation's ECU has more trouble adapting to the larger throttle body than the previous generations. The majority of 981s we have installed or sold the IPD plenum/TB package to have needed at least a PIWIS throttle body calibration (and often times a protune) for proper drivability and no CELs for MAF Inefficiency and Throttle Body Correlation. There are a minority of cars out there that after a few drive cycles and resetting the ECU end up adapting with little issue.

For example, just last week I had a client of mine come in for this exact installation on his 981 Boxster Spyder. After providing full disclosure he opted to run it without an adaptation or tuning, and after leaving the shop a short time later he did come pack with a Throttle Body Correlation CEL which I cleared for him. Despite the CEL coming back, he seems to be one of the few that adapted well. Here is his feedback.

"The first 50 miles or so, the car was gasping for fuel. It felt like the car was hard to accelerate vigorously. It accelerated not even like a nice family sedan.

Its not all bad news :-) After 200 miles of highway driving from your shop and another 150 miles of just driving around (350 miles total) at varying range of RPM on different gears there is very good improvement across the entire RPM range, especially the very low end of the RPM range where its is much needed.

There is also, a whoosh kinda sound and its subtle and nice."

I'd also like to say I have a great relationship with Greg over at IPD and chat with him near every week. I am a firm believer that his products are well worth in all applications.

COBB is constantly striving to revise and improve their maps for combinations of upgrades, and I do believe they have optimized maps now available and included for the IPD Plenum/TB and exhaust upgrades.

That being said, there is something to be said for custom protuning. Every car is a little bit different, and different brands of performance upgrades and combinations of them will have different degrees of potential with varying ECU datalogs. Recording your vehicle's unique datalog and sending it to a protuner will result in a more fully optimized file for your particular application. We have a COBB certified protuner in house that is very skilled, and would be happy to work with you in the event you'd like to pursue a custom map

I also noticed you were looking into headers for your Spyder, and I just received these dynographs from one of our distributors in Colorado. Even with the high elevation, they are performing exceptionally well





Sport Headers



Race Headers

John@Fabspeed

Darren as always you are on point with your insight and education to fellow members

I'd also like to mention that it is a rare occasion where you find exceptional people working in the aftermarket industry. I would never hesitate to say that Sam and Mitch most certainly are, and I enjoy having a great working relationship with them both.

digitalrurouni

I am kind of interested in the side scoops myself for the Spyder but does it say GT4 on it? That I don't like at all.

skl

From what I've read (never seen them in person after being modded) you have to fill in the GT4 impressions and then paint your car colour. The debate is whether you just use the glue tape or also drill holes to install. Drilling anything on the car tends to freak out a lot of us!

Suicide Jockey

^^^^ Non-drill approach (previously posted by someone else):

digitalrurouni

Thanks gents!

s2ktaxi

does the inner scoop clip on or is it taped in as well?

coffeeycups

+100 and +1 on cargraphic

Richard.

any more modifications news ?

John@Fabspeed

Lightweight flywheel/clutch kits are the new wave of hotness for the GT4/Spyder. Saves a good 14 pounds of rotational mass for about $2400 for the kit. Much more responsive powercurve and throttle response not unlike that of a race engine, pulling harder from start to finish.

Also word down the grapevine is that someone will have a complete final drive gearing solution (about 20% shorter) available in early/mid 2017