i;ve ran bosch plat 2 prongs for 2 yrs no problems! once I got my arcing wires sorted...
For the stock heads, I recommend the good ol W8AC (Bosch Copper)
i put a heatrange colder (bosch FR6 because i can't get the ngk's local) in my bro's chipped 337 and it ran a lot smoother
I have used the Bosch Platinum +4's and I like them..... A bit pricey though.
I've had much success with BERU plugs on all of my VW's, especially my 16V's. Beru maks the stock/replacement plugs for Porsche, VW and Audi (I work at a Porsche dealership, I see it all the time)
i had a buddy purchase me a set of bosch platinum plugs. i installed the plugs this morning before going to work, removing the old plugs, i found the number 1 and number 2 are wet with fuel. after installing the platinum plugs, i cranked the engine. and it started! the idle was smooth. i took my vw to work today, and the engine pulled smoothly in all rpms!
I use Beru Utra-X UXF79 4 tips plugs. It's a great plug for my chipped B6.
I've run the platinum +4s in my GTI and I haven't had any problems but I haven't found them to feel any different than any other plug.
And I tried both the Bosch and the NGK back to back, and the NGK ran far better than the Bosch. The Bosch were terrible in my case.
I just put Bosch Copper plugs in my 2.0 L Passat and it's running like crap. I think I forgot to gap a couple of the plugs... Would that explain the rough running engine?
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