They're not popular among the MKIV crowd for some reason, but the MAFT Pro is compatible and has two maps for fuel, boost and ignition... and yes, you can wire in a switch to change it on the fly.
Yes, standalone EMS = An all in one engine management system.... technically the stock system is a standalone as no functions are passed on to external devices for processing. A piggyback is a device which attaches to your EMS and serves to alter or reinterpret data.
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