Final-year NC Miatas with the retractable hardtop have a loyal following, and this one adds a set of performance modifications. It pairs the six-speed manual with a custom ECU tune, an AEM intake, a Good-Win Racing exhaust, KONI shocks, and aftermarket springs and sway bars. Bidding stands at $1,300 with six days remaining at no reserve.2015 Mazda MX-5 Miata Grand TouringCars & BidsWhat it's worth right nowMarket data from Classic.com records unmodified 2015 Grand Touring PRHT manuals selling for $24,000 at 39,000 miles and $27,250 at 13,000 miles in March 2026. Modified examples trade lower, with a modified 2015 Grand Touring selling for $16,501 on Cars & Bids, and the broader NC market benchmark sits at $16,159.Modifications place this one below the stock cars. The final model year, the hardtop, and recent suspension work help, while the tune, the exhaust, and an intermittent check engine light narrow the audience and complicate emissions testing. Fair value lands between $15,000 and $20,000, with $17,500 most likely, since modifications rarely return their cost.2015 Mazda MX-5 Miata Grand TouringCars & BidsCondition and detailsThe modifications are well known in the Miata world. The seller lists a custom ECU tune, an AEM cold-air intake, a Good-Win Racing RoadsterSport exhaust, KONI adjustable shocks, aftermarket springs and sway bars, 17-inch Konig wheels, and a Mods4cars SmartTOP control. He clarifies the tune is for 91 octane rather than 93, and the included Dynotronics iFlash unit holds both the current and factory maps, so the car can return to stock.2015 Mazda MX-5 Miata Grand TouringCars & BidsThe service record is recent and useful. Carfax shows a rear wheel bearing, hub, and spindle replaced in June 2026, rear brake pads and a brake fluid flush in November 2025, and four tires, a lower control arm, a transmission fluid flush, and front brakes in 2024, with regular oil changes. The tires carry 2023 date codes.2015 Mazda MX-5 Miata Grand TouringCars & BidsSeveral items need noting. The seller states the check engine light comes on intermittently with a P0421 catalyst code tied to the exhaust and tune, which may affect emissions testing in some states. He also cannot confirm whether the car has a limited-slip differential. Chips, scratches, scuffed front splitters, worn touch points, and an inoperative CD player are disclosed. A pre-purchase inspection should confirm the differential and the hardtop operation.2015 Mazda MX-5 Miata Grand TouringCars & BidsThe offerSpecificationDetailMakeMazdaModelMX-5 Miata Grand Touring PRHT (NC)Year2015Mileage49,200 milesEngine2.0-liter inline-four with custom ECU tunePower167 horsepower and 148 lb-ft in stock form, tuned output not specifiedTransmissionSix-speed manualDrive typeRear wheel driveExterior colorZeal RedInterior colorBlackCurrent bid$1,300 with six days remaining, offered at no reserveInterested in this car? View the listing here.What makes the NC Miata uniqueThe NC was the longest-running Miata generation, built from 2006 through 2015. It was the first completely new design for the model and broadened its appeal with more comfort features and, most notably, a power-retractable hardtop that turned the roadster into a year-round car without sacrificing open-air driving.2015 Mazda MX-5 Miata Grand TouringCars & BidsIts reputation has grown as the market for analog sports cars has strengthened. The NC is heavier and larger than the cars before and after it, but it is also the most refined and practical, and final-year 2015 cars with the hardtop and manual gearbox now draw strong prices. Modified examples sit apart from that, since buyers paying top money tend to want stock cars.My takeAt $1,300 with nine bids and six days to run at no reserve, my call is $17,500, with $20,000 possible if a buyer wants a sorted, modified final-year NC. What appeals is the combination, since a 2015 Grand Touring with the hardtop, the six-speed, quality suspension upgrades, and fresh wheel bearing and brake work is a ready-made fun car. What holds it back is the modification list, because an intermittent check engine light, possible emissions issues, and an unconfirmed limited-slip differential will steer stock-car buyers elsewhere. Confirm the differential, then bid.Disclaimer: This post is for informational purposes only. We are not a dealership or broker. All vehicle specifications, pricing, and availability are subject to change without notice. We are not responsible for typographical errors, omissions, or the accuracy of the provided information. Please verify all details directly with the seller.