As a parts guy, me and the other counter people the auto parts store i work @ usually reccomend using oe manufacturer for plugs(ngk for kia),however thats not required....there are people out there that swear by a particular brand or even refuse to use a certain brand which is why we carry autolite,ac delco,ngk,champion,bosch, and denso plugs....we sell all of these brands all day long without any troubles or complaints...if bosch plugs really crapped out that fast they wouldnt still be in business...i personally tried a set the last tune-up i did....bout 2 years ago and still going strong,even the way i drive with a HEAVY foot...i'm sure they will work just fine for you as well <img src="/forums/images/graemlins/cheers.gif" alt="" />

Auto Parts Professional
95 sportage sold but not forgotten