Jevi Javi

- More Power, less weight, Weissach Style Tips, eliminate GPF
- 20" x 9" front wheels

Avera

The Weissach style tips are beautiful and of properly large diameter . . . that said, my preference would be similarly large diameter tips that are raw pipes (e.g., like the Crack Pretzel). To me, those look mean as h*ll and would be more desirable

The Dundon headers/OAPs remain the best aftermarket tune available for the GT4, so I have little doubt they will deliver the same with the RS. Similarly, if Dundon sticks with the header/OAP combo they have for the GT4, the GPF will be gone with the RS.

No comment on the front wheels, other than to say I think the RS wheels are beautiful. I suspect your desire in different wheels is more performance-related?

Avera

ltfl09

Can I buy your car once you guys are done developing lol

Greybadger

For those of us who want to keep engine warranty and aren’t US based…

Do a multi-link suspension setup for the rear


That would be a killer mod

usctrojanGT3

That is exactly why I want the headers and OAP pipes while keeping the OEM muffler. That's what I had on my 718 GT4 and it was a perfect set up in terms of extra power without drone and only loud when I was over 4-5k rpm on the gas.

Avera

I have to agree with you 95% . . . Dundon header/OAsP with OEM rear box is almost the perfect setup.

Louder than anything I have heard that is not straight-piped.

Delivers more TQ/HP gains than any aftermarket tune available.

OEM rear box manages drone/resonance impeccably with decent tone.

I threw on the JCR Race Pipe to get that straight-piped decibel level and RSR tone. I got both in spades . . . along with the most unbearable drone/resonance imaginable. I crossed the line and the OEM rear box is back in its place.

So, as to the 5% . . . I have been holding out hope Dundon could deliver the rear box solution myself and many other Dundon header/OAP owners have been hoping would become available. Unfortunately, @Ted@dundonmotorsports sounds less than optimistic Dundon can deliver a small miracle.

Given the RS has the exact same chassis as the GT4, I do not THINK the fact it has a different engine is going to alter the scenario significantly, if at all. If one chooses to go with Dundon headers/OAPs, the OEM rear box will be just about mandatory and the combination will be better than most anything else on the aftermarket. . . since this is a Dundon thread, I am certain most will not mind my bias.

Avera

P.S. As for the 'only loud when I was 4-5K RPM' part, well, I took care of that with valve shaft collars. Eliminated the abrupt transition from quiet to screaming when the valves fly open.

usctrojanGT3

I didn't mind the car being loud when I went over 4-5k RPM when I was WOT because it was a good aggressive pissed off kind of loud and I really only did that at the track (I had catless headers). This go around with the 4RS I'll get headers with cats.

jmartpr

There's one available for the GT4 which could potentially be adapted to a 4RS...but there's so little info on it and the cost is pretty high.
Might as well do a proper set of dampers/springs (KW, Ohlins, MCS, etc) with some minor suspension and call it a day.

GT4RS maniac

over axle pipe with pressure sensor link for OEM muffler (Euro - ROW spec)

Thanks

horns

Don't hold your breath. I was told the target was Jan 2022 when I bought the headers. I would have gone a different direction if I knew the muffler wasn't coming. For those still waiting, I hope you eventually get a solution, but that sounds like it's still uncertain.

Ksdaoski

Thanks for posting these!

Ksdaoski

Air filters seem pretty easy to access

BabyNSX

One thought occurs to me about the exhaust... if you develop the RS exhaust system to require the use of the Dundon back box then I see no reason why the existing design you have for the GT4 back box can't be made to work with the new header/OAP design you cook up for the RS. The only reason I see that Porsche changed the geometry of the muffler connection was to manage the longer secondary cat + OPF. Knowing you'll likely come up with a much more compact - cat only - solution you could relocate the connection back to where it is on the GT4. Regardless... I'm still looking forward to seeing what you do with the GT4rs!

Thanks also for sharing that quick tear down

Avera

@BabyNSX

You and I have communicated privately and it is no secret we are both among several who have been holding out for a rear box solution that seems more and more to be asking for a miracle.

If I were to guess, we will find out - despite their best attempts - Dundon will never come out with a rear box solution for either the GT4 or RS that matches up well with their headers/OAPs. Dundon will come out with headers/OAPs for the RS that - coupled with the OEM rear box - will satisfy the majority.

'Majority' is an awkward term in this case because RS owner already live in rarified air. Not sure how much aftermarket exhaust business is out there for a lot of competing companies trying to get a piece of the extremely small pie.

Avera

cafe_racer

Great tear down video. Thanks Dunedon. I’m looking forward to seeing what parts you suggest for upgrading my gt4RS.