I also have an ´02 ZX2. I put a K&N very early on. I think it helps out the God-awful idle on those things. I also recently put on an Iceman intake. I posted a review of it under parts review. Also took out the extra stuff under the stock air box. Once again helping the idle quality. Better bottom end too. If you have an auto like me, then anything is an improvement, imho the ZX2 is a dog off the line. Short version, Yes. it helps.