Nitrous Express 4150 Assassin Plate Stage 6 Nitrous Kit (50-300HP) w/15lb Bottle

Nitrous Express 4150 Assassin Plate Stage 6 Nitrous Kit (50-300HP) w/15lb Bottle

Marsoni

M251S

$618.34

Get it in 3 business days with 1 day shipping. Friday, May 29

Nitrous Express 4150 Assassin Plate Stage 6 Nitrous Kit (50-300HP) w/15lb BottleAssassinate the competition with the Assassin plate system. The Assassin is the most technically advanced single stage plate ever designed. The CNC machined design integrates the nitrous and fuel discharge ports into the outer perimeter. The Assassin offers a unique perimeter spray pattern that assures perfect nitrous fuel distribution. Which in turn solves the problems commonly found on single plane manifolds, particularly small and big block Fords.

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Id give it a 4.5 star only because the holes weren't well rounded on the interior were they punch through the mold to make the holes. Other than that I tested if it holds full of water and all seals work. The fix: grab a knife scrap the inside ring and it will fall off. If you want a more perfect feel (not rough) heat up a flat head or screwdriver that has a round stem and use that after heating to lightly melt the plastic to smoothen it out. I didnt do 2nd part dont care. Great size, will fit under motorcycles easily like my 04 zx10r.

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Reviewed in the United States on May 16, 2026

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Steve DeMola

Los Angeles, US

★★★★★ 5

Works great.

Color: Low profile oil Drain Pan for Motorcycles

Good size when changing the oil on a Harley Touring motorcycle.

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Reviewed in the United States on May 8, 2026

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