Spark plug NGK or Denso

On 02/18/2016 I switched the plugs with the Denso IKH22 at 15800miles. Jetta is more rev happy. No slow down throughout rev range, and no more pause hesitation between 3.8k-4k RPM. Just pulls, and pulls even harder. Also idle very smoothly.

I actually have those exact plugs in mine for about 10K miles now and have not hat any problems.

I have been using them, never had problems. Start up is faster, idle is smoother, throttle feels more responsive.

I switched to the Ikh24 and it really smoothed the car out.

Replaced my OEMs this summer to Denso K16GPR-U11 and has been getting really good mileage and smooth idling since then. Now planning to try NGKs next time.

I miss my NGK V powers. I always ran them in my 1.8T's and changed them every oil change because they were so cheap to buy. Put these in and she's as smooth as butter. Torque profile feels better at partial throttle too. Needless to say I am very happy.

I began reading and ended up buying a set of NGK BKR7E-11 (Stock# 4464). From researching, it looks that the ones I got had the v-groove center and a little less projected tip. They are also 2 steps colder. It's been about 3k miles and the car is running great. Big difference over the Denso plugs as far as smoothness. I did not notice a difference in mileage.

I can only comment on the ZFR5E-11 ... and let me say...THEY ARE AWESOME. Now of course these are not "official" OEM spark plugs for our engine, so just remember that...but the results speak for themselves. I'll say it again for effect... THE NGK ZFR5E-11 STANDARD COPPER SPARK PLUGS RUN GREAT IN VW 2.5L INLINE-5 CYLINDER ENGINES !!!!!!! Just had to gap down to .040"/1.0mm. The butt-dyno says YES, idle is smoother, MPG's are up (couldn't get more than 28 highway before, recorded multiple highway cruises on the NGKs at 72-75mph in the 30.X range!), and, oh yeah, did I mention they cost $2.50 per plug? The wallet also says YES. So run along now to your local auto parts store, where they are literally ALWAYS in stock (part #4435) and rejoice at the thought of walking out with 5 quality NGK copper plugs for less than $13.

I have tested the BCPR7EIX which did not make any difference to my car. I felt that the standard plugs worked well vs these.

I changed them over to the NGK bkr7eix #2667 and was wondering if spark plugs would have any effect on boost? It seems like the car isn't boosting as it should, I have a boost gauge and it also seems the PSI is a couple LBs lower than before the spark plug change. I have not experienced any misfires (that I can tell) and no CEL it's just the boost doesn't seem as high.