★★★★★ 5
A reliable set of spark plugs.
They’re made in Germany, what else can you say
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026
Nitrous Outlet 8 Cylinder Dual Stage Direct Port System - Four .112 Nitrous Solenoids/Four .177 Fuel Solenoids/Compact Distribution Blocks/Compression Fittings/Annular Discharge Nozzles (Gas)(45-55 psi)(100-400HP)(12lb Bottle)
Marsoni
M251S
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Friday, May 29
Nitrous Outlet 8 Cylinder Dual Stage Direct Port System - Four .112 Nitrous Solenoids/Four .177 Fuel Solenoids/Compact Distribution Blocks/Compression Fittings/Annular Discharge Nozzles (Gas)(45-55 psi)(100-400HP)(12lb Bottle)Flow Up To 800HP Per Stage . 112 Nitrous & . 177 Fuel Solenoids Wet System Dual Stage All Hardware, Fittings and Accessories Included Includes Jetting For 100 200 300 400HP Straight Blow Through Nozzles 45, 55 psi Fuel Jets Included High Horsepower: Nitrous Outlet's 8 cylinder direct port systems are designed to be high flowing for high horsepower applications. This system comes with two wet nozzles per cylinder capable of flowing 200 HP each. Racers
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4.1 ★★★★★
Based on 780 reviews
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Product Reviews
★★★★★ 5
Work as well as the NGK's
Bought for a 2016 Mazda 6, I had NGK's in it for 5 months and had misfires, didnt have the money to throw more NGK's at it for troubleshooting. Bought these to try and they work great so far.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026
★★★★★ 4
Faulty plug? Otherwise great set
Definitely better than the old plugs that probably had 80k miles on them.
The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine.
Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.
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Reviewed in the United States on April 27, 2026
★★★★★ 5
Upgrade from OEM
After seeing a quite ludicrous $403 quote to change 4 spark plugs in a Mazda3 I decided to show my son how easy it is.
These were an upgrade from OEM parts. They were gapped perfectly for the car.
They took 20mins to fit and work fine.
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Reviewed in the United States on February 11, 2026
★★★★★ 5
Very good
The best quality. Runs like new again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 12, 2026
