The installation of the new muffler was really easy, and it bolted right in place of the old muffler. It would also bolt in place of the stock muffler as well.
The new muffler looks pretty slick. The stock muffler’s shape helps complement the OEM diffuser, and the Dundon mufflers also keep the same geometry so as not to disturb the airflow from the diffuser. The new muffler sounds fantastic; it sounds better than the excellent-sounding 321 muffler, with a high rpm shriek just like a Cup Car. Inside the car at highway speeds, it still sounds only a little louder than stock, but outside, especially on the throttle, it really sings!
With our LITEBLOX Lithium battery (which is still working perfectly over 4.5 years later), Advan wheels, and the Dundon exhaust system, we have managed to shave over 75 lbs off our car. That in itself is pretty amazing. Consider this, Porsche claims that a 991 GT3RS with ceramic brakes weighs about 3153, pretty light for a modern car. The factory lightweight Weissach package saves 38 lbs to 3115 lbs total, by using lighter magnesium wheels and more use of some small carbon fiber bits (A carbon roof for the Weissach replacing the already trick magnesium roof on the RS to save a whooping 1 lb), lighter carpet, etc. All for the extra price of $31000. Using the Porsche data as a baseline, Project GT3RS would weigh only 3078 lbs, lighter than the Weissach, and has nearly 40 more hp to boot! This is assuming the accuracy of the Porsche-supplied data. On our scales, our car weighs 3158 lbs with a close to full tank of gas. We have the factory optional large capacity 23.7 gallon tank, which probably adds some weight, and the fuel adds some weight as well. In our case, this was over 100 lbs of fuel. Considering the fuel weight, Porsche’s numbers are probably in the ballpark. Either way you look at it, our weight saving probably equates to nearly a full tank of gas.
We replaced the OEM GT3RS side skirts with sideskirts from a Turbo model. These are more aggressive and stick out 3″ more. They really look better visually, probably helping the car’s aerodynamics to a small degree. visually, they are a good match for the size of the front splitter and do a better job of keeping rocks off the side of the car.
We replaced the stock 20×9.5″ 50mm offset front wheels with an Advan GT Wheel in 20×9.5 with a 45mm offset wheel from Mackin Industries. These fill the wheel well better visually and rub less. Yes, the OEM fitment rubs on the inside at full lock! The Advan’s are a lightweight, truly forged wheel. The five-spoke design looks awesome and is much easier to clean than the stock wheel.
The new rear wheels are 21×12.5 44mm offset Advan GTs, which stick out 4mm more than stock for a flusher look. The front and rear Advans’ wider tracks probably have a slight improvement in lateral grip. Since the OEM wheels are forged and super light, the Advans are only about 1 to 1/2 lb each lighter than the stock wheels, despite being of lightweight, fully forged construction in their own right.
10 comments
I honestly wonder about the benefits of a carbon roof in the CA sunshine. It can get so hot that the epoxy returns to the plastic phase and you get delamination. Fortunately, it’s not a structural part so you don’t have to worry about catastrophic failure, but it’s definitely not something I would ever want to pay a premium for.
It looks cool.
Great technical explanation.
You could have mentioned something about moment of inertia and the distance from the CoG location, but you went with the dumbest excuse available.
Within the Porsche world, “it looks cool” is the correct answer. The vast majority Porsche of buyers give a rats ass about any weight savings of the roof which is only about 4 pounds; they get the CF roof because it looks cool. Did you know you can buy an optional carbon fiber owners manual wallet for $810? The door sill guards in carbon fiber and illuminated are a $1250 option. It’s a different mindset.
Khiem, on the RS it’s only one pound difference. This is because the RS comes with a magnesium roof.
Can you really get a carbon owners manual wallet? The stock thin vinyl one is probably lighter. Heck on the RS they took off the cool Porsche emblem and replaced it with the lightweight sticker and charged more!
Because for a one-pound difference, as stated in the story, the main reason is looks cool. I think the trick RS magnesium roof is probably better for a street car.
If you want mental gymnastics for a one-pound difference, you are a weird cat.
Finna be PorscheIQ pretty soon. Love it.
Man, your car is getting light. It’s only about 90lbs more than my 718 T was stock. I’ve taken a little bit of weight out of it, but also added in some weight. I have a couple more things to do to take out weight without compromising the daily liveability.
I have some carbon Weissach edition sway bars that should shave another 12 lbs off. I think my planned strut tower reinforcement and brace might cancel some of that out though. Future carbon airbox will probably shave a few more lbs out of the back.