Here is what i do to pass emissions. Take it to a shady shop pay my 100 bucks and bam i have passed. You could also try running alcohol in your gas probally not to safe but i have heard it works. Just dont do it for a long period of time.

Mk3 VR6: Cheapest is around 20 bucks but it usually runs 25. Who the hell worries about emission that shit is cheap