An Ignoble Experiment: Uber-Modified 997.1 GT3

June 29, 2026

Good Morning! Look at that, a 100% sell-through rate. While not uncommon, it’s a far cry from the STR in the 50s we saw earlier last week. Barrett-Jackson certainly helped, with every car crossing the block at no reserve.

THE MARKET

Sell-Through Rate (STR): 100%
Market Volume ($): $3,901,445
Market Volume (Units): 17

TOP SALES

2015 Porsche 918 Spyder $2,695,000* Barrett-Jackson
2007 Porsche 911 GT3 Modified $185,900* Barrett-Jackson
1998 Porsche 911 C4S Coupe 6spd $184,000 Bring a Trailer
2011 Porsche 911 Turbo S Coupe Modified $110,000* Barrett-Jackson
1990 Porsche 911 C4 Coupe Modified $110,000* Barrett-Jackson

SPOTLIGHT

PHOTO CREDIT: BARRETT-JACKSON

This 2007 911 GT3 was built for the 2014 SEMA Show, and I can honestly say I’ve never seen a 997 GT3 modified quite like this. The one-off build featured a Vollkommen Design carbon-fiber widebody that added 2.5 inches up front and 4.5 inches in the rear, along with a GT3 Cup-style rear wing, matte Gold DPE forged wheels, and an Audi Nardo Gray finish with Red accents. Inside, the cabin was equally unique with Red diamond-stitched Alcantara sport seats, a body-color center console, a 997.2 Alcantara steering wheel, Numeric Racing short shifter, and more.

The factory Mezger engine gave way to a twin-turbocharged 997 GT2 long block featuring Garrett G25-660 turbochargers, a SpeedFactory Racing water-to-air intercooler, Syvecs engine management, and a custom titanium exhaust system. Supporting upgrades included JRZ RS Pro remote-reservoir coilovers, an RSS Tarmac Stage 2 suspension, H&R lowering springs, and a new clutch, flywheel, and slave cylinder installed earlier this year.

Like I said, I’ve never seen a 997 GT3 this modified, so as you’d expect I have 0 comps. Even for stock examples, comps are slim as only one 997.1 GT3 has sold online over the past twelve months. That car was an 8,000-mile example that sold for $185,000 back in September of last year. Our Spotlight Car was right up there, selling for $185,900 all-in. With prices of stock examples where they are now, you’d have a hard time justifying a build like this. Plus, I can only imagine the cost of the modifications.

NOTEWORTHY SALES (AND NO-SALES)

PHOTO CREDIT: BARRETT-JACKSON

At 13,091 miles, this 2015 918 Spyder is one of the highest mileage example’s we’ve seen over the past twelve months. Finished in Liquid Metal Silver over a Black leather interior with Acid Green piping, this example featured a Carbon Interior Package along with Weissach Carbon-Fiber rear diffuser blades, but not the full Weissach Package. It sold all-in for $2,695,000, which tops cars with much less miles sold towards the end of last year. But we all know where 918s have gone since then. 📈
This 1998 911 Carrera 4S Coupe 6-Speed came finished in Arctic Silver Metallic over a Black leather interior and showed 53,000 miles on a repaired odometer. Coming out of 26 years of ownership, it featured the Motor Sound Package along with Aerokit front and rear spoilers and looked to be in nice condition with service records and paint meter readings in the gallery. If you’re looking for pages of banter about paint meter readings, this is your car. Thankfully, some of the more negative (less informed) comments didn’t really hurt this one as it sold at a final bid of $184,000, right within estimates and a fair price for both parties.
The last time we saw this 2002 911 Turbo Coupe 6-Speed was back in August of 2024 when it sold for $58,000. Now showing 81,000 miles on the clock, this Arctic Silver over Black example looked to be in nice condition and was slightly modified with body-colored bumperettes on the back, clear side markers, Bilstein dampers, and more. It sold this time around at a final bid of $91,996, topping both its previous sale and high estimates of $76,200.

NEW LISTINGS

PHOTO CREDIT: BRING A TRAILER

Production numbers don’t always mean more money. Case-in-point: The 356B Notchback. Porsche built roughly a few thousand T5 Notchback Coupes vs. over 10,000 standard Coupes, yet Notchbacks typically track lower with average prices sitting around $55,000 while Standard Coupes average almost $70,000. This 1961 356B Notchback comes out of 62 years of family ownership and has been repainted in its factory shade of Slate Gray over a Red leatherette interior. The replacement flat-four was installed prior to the selling family’s acquisition in 1964 and was rebuilt by Vic Skirmant in 2012. It previously failed to sell at a final bid of $69,999 back in July of last year, which would have been at the top of the Notchback market. We’ll see if it can bring similar money this time around.
Another car out of long-term family ownership is this 1973 911T Coupe 5-Speed that came out of 48 years of family ownership. Finished in Sepia Brown over a Brown leatherette interior, this 911T had plenty of work completed in 2025 including refreshing the fuel system and ignition components, as well as reconditioning the throttle body, resealing the air box, and replacing vacuum hoses, shifter bushings, sway bar bushings, and much more. The core market for LWB 2.4-liter T Coupes sits at $69,400-96,400, with this car currently bid to $73,911. But with all the work completed on this one there’s a good chance it breaks out.
The opposite of long-term ownership is this 1995 911 Carrera 4 Coupe 6-Speed that was purchased by the seller earlier this year. But that’s not why it’s featured here. Finished in Polar Silver Metallic over a Blue leather interior, this 993 was well-optioned from the factory with 18” Turbo Twist wheels and M030 Sport Suspension. Showing 59,000 miles on the clock, and looks to be in nice condition with paint meter readings and plenty of records in the gallery. The current high for a 993 C4 Coupe sits at $110,000, which was also set by a Polar Silver coupe with 59k. This one should be up there as well.

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AUCTIONS ENDED JUNE 27th-28th

2015 Porsche 918 Spyder $2,695,000* Barrett-Jackson
2012 Porsche 911 C2S Coupe $76,500 Bring a Trailer
2011 Porsche 911 Turbo S Coupe Modified $110,000* Barrett-Jackson
2007 Porsche 911 GT3 Modified $185,900* Barrett-Jackson
2002 Porsche 911 Turbo Coupe 6spd $91,996 Bring a Trailer
2001 Porsche 911 GT3 RS Race Car $60,500* Barrett-Jackson
2001 Porsche Boxster 5spd $10,999 Bring a Trailer
2000 Porsche Boxster 5spd $18,150* Barrett-Jackson
1999 Porsche 911 Cab. 6spd $33,000* Barrett-Jackson
1998 Porsche 911 C4S Coupe 6spd $184,000 Bring a Trailer
1990 Porsche 911 C4 Coupe Modified $110,000* Barrett-Jackson
1990 Porsche 911 Cab. Modified $104,500* Barrett-Jackson
1988 Porsche 911 Turbo Modified $56,100* Barrett-Jackson
1988 Porsche 911 Targa 5spd $50,200 Bring a Trailer
1985 Porsche 911 Coupe Race Car $35,750* Barrett-Jackson
1979 Porsche 928 5spd $20,350* Barrett-Jackson
1978 Porsche 911SC Targa 5spd $58,500 Bring a Trailer

*Prices in Red denote a high bid and no sale. All prices are high bids and do not include the buyer’s premium unless otherwise noted by a (*). Cars listed include those offered on US online auction websites and at US in-person auctions. Unless noted, 12-month averages, lows, and highs are from online sales from Bring a Trailer, Cars & Bids, and PCARMARKET.