I have them in my 1970 jaguar E-Type and the performance improvement has been phenomenal including better gas mileage. I don't have but a couple of hundred miles on them but I sure like the additional performance they are giving me.

These are not your latest Fad of a spark plug, They work awesome as stated. After all these years of trying every spark plug brand out there. I now am beyond happy with these plugs since I can actually feel the consistent power from zero to my top end. Now the Pulstar's are going in my fleet! I cant wait to try them in my snow machine.

The change to Pulstar® plugs gapped to factory 0.035″ was the only change made for this test. We waited for the first tank of fuel to burn through before making comparisons. At that point there were several distinct improvements: Better tip-in throttle response at any road speed and under heavy acceleration. Less throttle needed to sustain normal “cruise” road speeds. Less downshifting on grades with cruise control applied. Acceleration improved with both forced and cruise control downshifts. Distinct improvement in fuel efficiency; approximately one mile per gallon improvement (5.5%) under “city” and “highway” or interstate test conditions; this engine has always started well.  Click here to watch the video.

I don't really write reviews… but I felt I had to with these plugs. I researched the website and technology and it made sense. I had no idea a spark plug could make such a difference in performance until now!! I have a 2014 EFI Triumph Bonneville - I have added a ton of performance upgrades and even remapped the fuel injection for more performance... All of the upgrades made a difference.. but none as dramatic - nor a bigger bang for the buck - as swapping out my plugs for these. I will put these plugs in anything and everything I have a spark plug in if possible. To me it's a just a no brainer. Do yourself a favor and get them.

I tried a car while using Pulstar... the performance is totally different from others, high power! Smooth! Rapid react! Even the engine sound also great a lot- Marvelous! I love it!!

The car feels snappier, more responsive to the throttle than before...it feels noticeably stronger and I’d be willing to bet it is stronger and probably in the vicinity of the 5-7 hp gain Pulstar documents were achieved in the Tahoe as well as a 2012 Charger.

Got these, installed them into my Jeep, and so far, it's been running smoother and more economical than before. Previously, I was getting ~15 miles per Gallon, now it's 20 MPG. Horsepower has increased, and the acceleration is faster than before.

I put them in my '64 lancia flavia replacing very good champion n3 plugs. I set the car up for a fast idle at 1100rpm and after the plug swap the idle was 1400rpm and the mileage went up about 10%.

I came across Pulstar spark plugs in some 4x4 enthusiast forums, and after looking through their website I was so impressed with all the background information provided (both the level of scientific analysis, and the sheer volume of empirical data) that I decided the generally high-price was justified, and I would try the plugs in my own vehicles (a 1989 Landcruiser and a 1997 4Runner). IMMEDIATELY I noticed an improvement in throttle response; it was particularly obvious in my 4Runner which suffered from an 'engine stutter' issue that I had been trying to properly diagnose and fix for about a year. Right away, the stutter issue went from being noticeable in approx 15-30% of certain throttle situations to scantily noticeable at all, and when it is noticed it's only in approx 0-5% of the same throttle situations. I also noticed a significant improvement in fuel economy. I am almost religious when it comes to calculating my overall fuel economy for the last tank of gas after every fillup (I even know exactly how much my different-than-factory-sized tires impact odometer readings on both of my trucks, based on distance comparisons between odometer vs. GPS data) and prior to changing the spark plugs I would average between 16-18 MPG (often in the high 16s - mid 17s, and only reaching 18+ on tanks that were nearly 100% highway miles at cruising speed) in the 4Runner. Now, since installing Pulstar spark plugs, I've filled-up 4x tanks of gas in the 4Runner (none yet in Landcruiser) - and on the first three (which were no different from my normal weekly commute to/from) I averaged 18+ MPG (up to 18.5) and on the last tank, which admittedly was quite favorable in that it was 260+ miles all on the highway at cruising speed (not more than 75mph) and coming from Bishop CA to Los Angeles CA (an overall drop in elevation of about 3,000ft) I averaged an ALL-TIME-HIGH overall 20.1 MPG!

I had a choice between good performance on short drives, or good performance on longer drives, and always bad performance in cold weather. After I installed a set of Pulstar plugs, I put the stock idle feed restrictors back in and leaned out the idle. Now, throttle response from a cold start is flawless and throttle response remains so even when the engine is fully warmed up. As soon as the snow melted, I went for a 90-minute drive in 30-degree weather covering all conditions from country roads to freeways to city streets without a single stumble. I went for another long drive on a recent 65-degree day with perfect performance again. On both drives I found I was more likely to hit the rev limiter in first and second gears so power may be up as well. To summarize, I thought the only way to solve the drivability problems was to replace the carburetor with a fuel injection system, but just installing the Pulstar plugs was enough. I am extremely pleased with how these plugs work.