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Nitrous Outlet 6 Cylinder Dual Stage Direct Port System - Two .122 Nitrous Solenoids/Two .177 Fuel Solenoids/Distribution Blocks/90 Degree Discharge Nozzles (Gas)(45-55 psi)(75-375HP)(No Bottle)

Marsoni M251S
Sale price$1027.49
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Nitrous Outlet 6 Cylinder Dual Stage Direct Port System - Two .122 Nitrous Solenoids/Two .177 Fuel Solenoids/Distribution Blocks/90 Degree Discharge Nozzles (Gas)(45-55 psi)(75-375HP)(No Bottle)Flow Up To 800HP Six Cylinder Wet System for Gasoline Distribution Blocks Dual Stage 90 Aluminum Nozzles All Hardware, Fittings, and Accessories Included Includes Jetting For 75 150 225 300 375HP 45 55psi Fuel Pressure High Horsepower: Nitrous Outlet's 6 cylinder direct port systems are designed to be high flowing for high horsepower applications. This system comes with one wet 90 Aluminum Nozzle per cylinder capable of flowing 200HP each. High
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  • We offer a 30-day return/exchange service after receiving.
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4.5 ★★★★★
Based on 1227 reviews
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Product Reviews
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grog
Chelsea, US
★★★★★ 5
If pump doesn't seem to work
Size: For 85-300 HP, Size: For 85-300 HP
Hi....I apologize it took me a while to get back to you with my results. Here is what I discovered about the pump and will also apply to some of the other comments I read in the reviews with people not getting the pump to work: 1.) I removed the pump to check the proper direction of the impeller and it was correct as can be seen in the photo. 2.) I built a pump shaft attachement so that I could operate the pump with a power drill. 3.) I attached the water muff to the unit and tried to pump water.....it wouldn't do so. What I did see however was that even at high hose discharge and small leakage at the muff I could not fill the water cavity in the housing. 4.) I installed a strap around the muff and tightened it very tight and THEN at high hose pressure I was able to get the cavity to fill with water. 5.) At that point I activated the drill and was able to get the pump to actually pump water. I then removed the pump housing and removed the O-Ring that resides on top of the impeller, reassembled and it would not pump water. Since the O-Ring sits higher than the original does I wanted to make sure that it was necessary to have it in the pump. 6.) I reassembled the engine and kept the tight strap on the bottom and finally it pumped water into the engine. My conclusion that you can reply to other buyers if they have a problem: Do NOT underestimate 2 things....1.)the lack of ability of the pump to draw water up AND 2.)the fact that if the muff leaks it will NOT fill the cavity when common sense says it should. This was a 120hp Johnson. The engine bottom must be immersed fully or the muff must be very tight on the lower unit for the pump to function. Please feel free to post this if you wish.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 12, 2024
M
Verified Purchase
Monchita
Los Angeles, US
★★★★★ 5
Exelente
Size: For 85-300 HP
Exelente
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
D
Verified Purchase
Dave Murray
Port Orchard, US
★★★★★ 5
Good as new
Size: Package Dimensions ‎6.02 x 4.02 x 2.05 inches
Fitment was great and works as it should. Good quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2025
K
Verified Purchase
Kenny
Draper, US
★★★★★ 3
Incorrect motor listed. Far smaller impeller than what's in the 6 horse johnson.
Size: For 5.5HP 6HP 7.5HP
It seems to be of good quality. However it does not fit a 6 horse johnson as it states. Therefore it will not pump water or function for my purposes. It was a waste of money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 15, 2025
S
Verified Purchase
Sylvia E.
Waukegan, US
★★★★★ 5
OE Quality Part
Worked perfectly. Everything needed is there.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 27, 2026

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