The NSR12S5 (NSR5), and NSR12S3 (NSR3) are MICROCASTED versions of the NS12S5 (NS5), and NS12S3 (NS3) which uses CNC MACHINED pistons.
They are both the same size/specs but they only differs in the pistons.
The the microcasted version has slightly more horsepower and rpm than cnc machined version.
Last edited by FREELANCE_RCer; 01-02-2008 at 10:02 AM.