Pin it! The B3121 is recommended for 4-cyl, 6-cyl and 8+ cyl engines where the vehicle is for track use with weight reduction as the primary goal. It can function in a race car with or without an alternator. It can also be used with upgraded aftermarket audio systems. Compatible with larger displacement engines for street or daily use. This battery replaces OE parts but weighs less and has a greater output.
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