I just installed the Bosch 4 prong (platinum if I remember correctly) in my 1999 A6 2.8. They made a HUGE difference. The car runs extremely smooth after the change. Mine were $5-7 each and I got a $10 rebate from Bosch. So they were a very cheap tune up for the car.
Denso iridiums run ~ $13.00 ea. They have a lifetime warranty. As for air filters.... I put a K&N pannel filtercharger in my stock 4.2 air box. performance increase was not much, but the engin sure sounds cooler now :lol:
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