Re: PC3 for 954&929
The R lets you map ignition as well although that's not usually a big deal unless you've got a faiily modded engine. If they're the same price you might as well get the R I guess.
USB is really handy if you're swapping maps regularly but PC's are usually set and forget so I wouldn't be too concerned about running a serial one.
I'm not sure if the serial and USB both have 250rpm mapping or if the serial only does every 500rpm so you might want to check that first.
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