Denso iridium are great for turbo cars
NGK are also good, but in experience denso iridium works better when running more than 1 bar of presseure
Bosch F5DP0R on a T3/T4 50 trim at 25psi daily. Love it.
I went to the dyno today and ended up with some pretty good #'s 321HP 304TQ Car was ran on SPS3 settings boost 9 timing 9 with Sunoco gt100 fuel. Temperature was mid 70's My car: 2003 A4 1.8t quattro ATP/Revo GTRS ATP Manifold Ecode Front Mount Intercooler Ecode Test Pipe Neuspeed Xtreme Turbo intake pipe Neuspeed Exhaust Stock airbox with K&N panel filter stock N75 valve working And NGK BKR7E plugs South Bend OFE SS clutch I could have done better if I had the right plugs (Bosch 3 electrode) and a manual boost controller but im pretty happy overall. Also the car was pulling 0 correction factors all the way through the rpm range so Lemmiwinks could have helped me with some more timing.
I just installed some of these NGK (BKR6E) plugs. I set the gap to .030 These went my 99 A4 1.8T Avant Quattro. The car is stock except for a K&N filter. Idle seems awesome and flawless all the way through the rev range.
I use Beru Utra-X UXF79 4 tips plugs. It's a great plug for my chipped B6.
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This part for Audi A4 is made around the world. We have reviews for spark plug manufacturers from countries such as: Japan, Germany .
In March 2026, the ranking of spark plug for Audi A4 on PartReview included 4 manufacturers. It is based on 5 reviews and 15 votes.
Last month, PartReview users preferred NGK. 40% of positive votes went to this manufacturer.
In second place: spark plug BERU — 20%.
Third place: Bosch with 20% of the votes.
In the overall ranking of spark plug, which aggregates opinions of owners of different car makes and models, these brands hold the following positions:
After seeing which spark plug owners of Audi A4 prefer, check other popular parts for this car. In March 2026, leaders on PartReview were:
You can also see what Audi A4 owners chose among such parts as: Timing belt, Water pump, Shock absorbers, Brake discs, Brake caliper, and others.
