Good-Win Racing Mazda Performance Parts

Westco 12V31M Miata Battery


Miata 1990-2005 · Electrical · Charging System

Part Number: 42-1007

Application: 1990-2005

Reg. Price: $149.00

Sale Price: $119.00


Westco 12V31M Miata Battery
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The Westco Miata battery utilizes absorbed glass mat technology for approximately 30% more cranking amps than a stock Miata battery. With this latest design, terminal location is OEM correct and installation of this Miata battery is easy.

Voltage: 12
Amp Hour: 31
CCA 475
Length: 7 1/2"
Width: 5"
Height: 7"
Weight: 25 lbs

Comprehensive Warranty: 4 Years - First Year Exchange, Balance Pro-Rated

FED EX Ground Service Only, lower 48 states USA only (no Hawaii or Alaska).

UPDATE 2014: the battery industry has done away with in-house testing, the 475 CCA was based on in house room temperature Midtronics tester, but starting this year these ship with independent lab test spec, which is 330 CCA measured at 0 degrees for 30 seconds (same battery, just a harder test).

*** Product images may differ from actual product appearance ***


I absolutely love my Roadster Sport headers, mid pipe and Q muffler. I have owned a lot of cars over the years and the quality of your product is truly exceptional. The ability to tune the Super Q is very much appreciated.

-- Tony G.

I red'all the parts in the order I placed and installed them in my car yesterday. I am beyond happy. The install went without a hitch. The results were fantastic. The new brakes track straight, make no noise, and stop the car authoritatively. The new rotors look pretty cool, which we all know isn't all that important, but having 6 women offer to bear your children, because your car looks SO cool is a good problem to have. Thank for great products and service.

-- Chaz C.