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Product Description: This is THE standalone USB emulator. It might be the ONLY one. It will emulate 2732A, 27C128, 27C256, 27C512, and more! Up to 4mbit (29F040) 8-bit emulation. Robust, USB-based realtime EPROM emulation in the palm of your hand! Battery backup lasts 75 years (standard AAA), so you can leave it in the car if you want to. With this device, you can upload an entirely new binary without a hiccup while the car is running. Or, you can change one parameter at a time. Fully compatible with TunerPro RT and TunerCat.
http://www.moates.net/product_info.php?cPa...&products_id=57
not too knowledgable on ecu's but i think it lets you do the tuning with this tool, and then when the tooling is done you burn the chip with the final results...