(SP-NP21) Spark Plug

Worthless crap!!! Bought it for my 95 Saturn SL in order to enhance my fuel efficiency. What I got is a miss fires the minute i pulled out from garage. I even upgraded my wires to 8mm. Nothing. Wasted $50.

Replaced my standered copper core plugs that had 80k miles on'em from my 99' Saturn SC2 and made a huge difference, granted I'm sure standered plugs would do close to the same. Didn't want to side gap new plugs so bought these as they are already 'proffesionaly' side gapped and half the price of Brisk plugs. These plugs are more or less copys/rip offs, but they work.Pro:Nice smooth idle, makes a I4 feel like I6Little extra low end power and better high end power. Had to relearn my start off at a stop, kept chirping the tires, tires now break traction when accelerating...Works very well with waste spark ignition systemCon:As with any plug you buy you need to check the factory gap, sometimes things happen during transport and the gap rating gets changed, one of the bridges was pushed against the core and had regap it.

Looking at some of the comments people were leaving on the web about these helping their Mini Coopers I thought I would give them a try. I replaced my relatively new stock set (NGK BKR6E's) with these SP-NP21 spark plugs. First impression was that it started a lot easier, barely turned before firing off. On a 15 minute test drive it seemed to pull better and the engine was much smoother all the way through the power band - all the way to 7K. Engine seems to idle smoother too. I have to make a long trip soon and will report back on fuel consumption. So far not disappointed I spent the money.

First put these in a 95 Prelude Si (H23). Afterwards the car had a strange pulse or surge. Changed the cap, rotor, & wires and the problem went away & the car drives great. Next i put a set into the 93 Civic LX (D15B7). This car never had any power & after putting in the Nitrodes what a night and day difference. I'm still amazed how it seems like a totally different car & now has some get up and go. It's hard to put into words what a dramatic positive difference these made, i wasn't expecting that. Next i put these into my 93 Civic EX (B16A). I already had Pulstar Pulse plugs in it but wanted to see if i could tell a difference between the two & i've used Pulse plugs with great results since they came out. I didn't notice to much of a difference but i did notice that the car had a lot more torque on the bottom end. I drive this car everyday so if there were any negative results i'd surly notice. Its been a few weeks since i put them in & the car idels & drives great. Next up after the holidays i'm going to try the Nitodes in the 98 Z28 (LS1) & see what happens.