The 1M50's were original on my car from the factory. The 1M51's were purchased in the last 5 years I believe one was from CZP and the rest from IPP. Each was packaged in bubble wrap and had the Nissan inventory stickers on them. I'm making no claim that either one is 'more' resistant to ethanol. Only that JECS has changed the part number for the 370 cc/min, side feed, pintle style injectors that they sell to Nissan.
"The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine
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