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Koyo Radiator Summer Special
FREE Shipping - ONE Week Only!


Koyo's ALL ALUMINUM performance radiators with Hypercore technology allows for thinner, more efficient cores. This means less weight on the nose and better cooling on track! Produced in Japan, Koyo's all aluminum construction is held to tight quality control standards that are illustrated in the outstanding Heliarc soldering, pristine tube and fin alignment, and mirror-like surface finish.

Koyo Radiators are completely plug and play with all OEM hardware and thicker aftermarket sway bars! Koyo smartly designed their radiators to take the factory cap, factory fans and even the factory plug so that service at your local dealer is not a problem and replacement parts are as close as your local autoparts store or Mazda dealer. 

NOTE new radiator cap NOT included, but we do offer KOYO Performance caps separately on the site. New drain plugs are included with each radiator. Already have a Koyo radiator but need to replace your car or plug, they are available below!

Radiator Hoses
Don't let a leak ruin your fun in your Mazda! Our silicone radiator hoses look great and last longer than the factory rubber.

1990-2005 Mazda Miata
90-93 Samco Radiator Hoses (RedBlackBlue)
94-97 Samco Radiator Hoses (RedBlackBlue)
99-05 Samco Radiator Hoses (RedBlackBlue)
Samco Red hose kit
2006-2015 Mazda MX-5


PrePay is live for the RoadsterSport SuperStreet Twin Tip muffler! 

This is a modified version of our all helmholtz Super Street muffler that adds small but complex three chamber dual tip muffler to add lots of user control, FOUR different sound settings with the included baffle cones, up to NINE different sound level variations if you mix in the optional packed baffles. Nonetheless, this is an aggressive muffler by design, even with baffles installed it is one of our more aggressive choices.

Result is a 15 pound wonder of a street muffler with more flexibility than found in any other choice. You get the great look of the RoadsterSport rolled and polished tips, the clean flow of the shortest possible path from the mid pipe to the exhaust tips to max your horsepower gains, unprecedented level of user adjustment...and minimal weight with these features.

ND Koni Sport Shocks Pre-Pay!


Koni Sport shocks continue to be THE street performance shock to replace your old and tired stock shocks with. 

If you have an ND...the wait is almost over! ND owners looking to be get ahead of the competitor in C-Street or have more FUN with their car! These are selling FAST so don't miss out on the first batch!

Pre-Pay is now LIVE for ND Koni Sport Shocks! Expected to ship in late June!


Don't have an ND, it's OK! We just got another shipment of these so all NA, NB and NC fitments are in stock!

Koni sport new

1990-1997 Mazda Miata  Front  and  Rear
1999-2005 Mazda Miata  Front and  Rear
2006-2015 Mazda MX-5  Front and  Rear
2004-2012 Mazda RX-8  FrontRearRear (Non-Bilstein)

Enkei RPF1

The best combination of strength, light weight, and quality manufacturing. Our old favorites with a classic design that always look fresh.

Almost every size/offset is on sale right now! With so many great options it can be overwhelming to sort through all the wheel sizes/specs, so here is a complete list of all our RPF1s for you!

NOTE Enkei only makes Bronze, Gold, and SBC (Special Brilliant Coating) in special order batches. There are no current plans for new batches of these, and we are getting LOW! Get them before they are history.

4x100 Lug Pattern

15x8  +28mm Silver ,  +28mm Black+28mm SBC ( Limited Quantities Available )
16x8  +38mm Silver

5x114 Lug Patten

17x8.5  +40mm Silver
17x9.5  +38mm Silver
17x10  +38mm Silver 
18X7.5  +48MM SBC
18x9.5  +45mm Silver ,  +45mm Black
18x10  +38mm Silver
18x10.5  +15mm Silver


Don't miss out on the next round of the Extreme Speed Roadster Cup at Button Willow 13CW on June 26th!


Good-Win Racing | 858-775-2810 | www.good-win-racing.com
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