Jay Cordeiro

Hi does anyone have experience with Fabspeed exhaust on a GT4RS? Specifically looking at:

Fabspeed Porsche 718 GT4 RS RENNKRAFT™ Long Tube Header System (2022+) SKU:FS.POR.718GT4RS.HDR.XX
HP (whp) / (crank):+48 / 53TQ (ft/lbs):+54
WT (lbs) / (KGs)::-5 / 2.3
https://www.fabspeed.com/fabspeed-po...r-system-2022/

Finding those performance increases a little to good. I would like some real world reviews.
Thanks

Alpha Ice

I'd still encourage folks to go with a Kline or JCR system, the sound (and sadly the higher price) is a nice improvement over the Soul & Fabspeed systems, but again the materials are much nicer inconel/titanium, and those require a lot more labor to produce.

UncleDude

I think people need to be clear on their priorities then go from there.... and even then you can get a miss!

Jay Cordeiro

Sorry, frankly I don't care about sound, it already sounds good enough. I care about weight and power. I am looking for performance. If anyone knows and can point me in the right direction I would appreciate it.

Inconel or titanium would be preferable.

SupremePower

PM inbound. Kline Inconel in stock

Alpha Ice

Price and performance go hand in hand, and the letters you need to know are JCR. But I agree with Uncledude, priorities are important. I personally didn't think the factory sounded great with the rear box that didn't mix the cylinder banks, and was fairly muted with the valves. Running the valves full open didn't really do anything for me either, but after doing the JCR manifolds and checking them out, fit and finish and getting a feel for the performance I was already in heaven. I still needed to fix the actual tone of the exhaust, and while I was preferential to going to the valved race pipe, I figured for a few more grand I would save another 15-25 lbs of weight. All together I believe the weight savings was in the 60lb range, and Jonny had dynoe'd the car to be approx 475 at the crank pre tune (this was in the fall of 2021 with all the items).
Manifolds

• -4.77kg (10.52lbs) Weight Reduction vs OEM
• +33.42WHP & +29.77WTQ (38.43HP/34.23TQ) vs OEM Exhaust Manifolds

Rear Lightweight pipe - Silenced, with cats (this combo is a bit louder, removes the valves, but is also the lightest. There are a lot of combination options).

• -21.16kg Weight Saving vs OEM Rear Silencer
• 25HP & 22TQ Increase

Valved Race Exhaust - if you wanted something less aggressive for a rear exhaust (would not replace the factory OAPS)

• 15HP & 6TQ Increase
• -9.86kg Weight Saving vs OEM Rear Silencer

jmartpr

been there, done that....several times!!!!!

tigerhonaker

UncleDude,

Absolutely !!!

You know if we were all willing to be 100% honest there probably is not a perfect after-market exhaust.

Some like I have one DEFINITELY has to be willing to adjust their driving.

In-Fact I'll go as far as stating if the owner is not willing to adjust their driving they will within a short period of time sale what they just purchased IMHO.

Terry

BabyNSX

This resonates very well with my experience with the Dundon setup. Like many header/OAP setups, if you operate with the valves open ALL the time then you are going to be simply making a lot of noise wherever and whenever you drive the car; however, with the valves closed you can absolutely live with this setup all day long and be producing just incrementally more noise that the stock setup.

With the OE setup I had to drive around with the PSE enabled all the time just to give the car a bit of character while with Dundon (and similar setups) you have a system that can go to 11 and interact with the car differently depending on what my surroundings are and what mood I'm in.

smithsonga

I’m 110% happy with sound and performance of my Soul headers and race exhaust. Tons of compliments on the sound. It’s incredible. I wouldn’t spend anymore $ unless you are obsessed with weight and want titanium.

rcfun33

@Alpha Ice I am also most interested in weight/performance. I thought I wanted a valved system to not annoy the neighbors. I assume you are happy with the volume of your car for around town driving. I guess with the catted/silenced version it probably isn't ridiculously loud. What are your thoughts in that area?

My other question is related to using titanium in the link pipes. Titanium gets brittle with heat and will crack. I had expected to use Inconel for the link pipes and titanium only for the rear section. Do you know what the warranty is? Do you have any concerns in this area?

Dave

BoxKing

This combination (SOUL) damn near hits the price point of the Kline Inconel OAP + Rear.... I did recently hear your setup locally on another 4.0, and I too found it to sound nice!

More important is the amount one is willing to spend to achieve, or get as close to what they want. I feel your budget is the most important factor. Most X-Pipe back box designs run ~$5000 +/-, and OAP's range from ~$1700-$2300 (only popular solutions accounted for). So, if you only want to spend sub $5K on both OAP+Rear (NEW), your only option is Kline SS - not too shabby of a choice. If your budget is sub $3K (NEW) - go for an OAP setup, BMC intake filters, PSE valve controller (or the cheaper collar mod).

One thing one must love, is their choice - hence why most (like myself) feel their setup is, if not one of the best. You bought it, its going to sound great, you probably spent some damn good coin, so enjoy your choice to the fullest

IMO, there are only a few choices when it comes down to the most loved, and tried/tested out there.
In no particular order:

SOUL (OAP, REAR)
JCR (REAR)
KLINE (OAP+REAR, only sold as a pair) SS/Inconel

Common theme on the rear boxes listed is X PIPE designs.

UncleDude

I think that is true, and I've been on that end of the spectrum. I can say with 100% honesty though, with the Kline system you can drive it exactly like stock. If the Kline had not worked out for me, I'd have just kept the stock system. 4 years in on this model, there is plenty of choice now and lots of feedback given. I've tried to be straight up honest with mine, and I know you have too.

Montaver

Kline is the GOAT for this platform in every respect. Sound, quality, value. Don't bother with just OAP's, do it once and do it right.

SpyderSenseOC

Kline OAP and back box can be had for sub-$5K? I did not know that.