Unless you're a Nissan engineer who knows exactly how VVEL works, you'll pay top dollar for a good standalone and it will sit there doing nothing, just looking pretty and doing what the stock ECU would be doing. Standalone engine management is good for motors for which there exists no stock mapping, such as hybridized EJ motors (251 NA heads on the FI blocks like the 257) in Subaru's, where the flow pattern is so high the ECU has no idea what is going on, especially when it was programmed for comparatively poor flowing turbo heads. I've heard you can do the same thing with the 35HR heads on the 37. That might warrant a standalone, if you also slap on a twincharged setup and run custom cams.
Generally speaking, standalone engine management is probably best left for race cars.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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