TRUST US DUDE. You will be completely satisfied spending $350-$450 for a good woods/trail type port. Best bang for your buck and no it does not make you machine any less reliable. A port job, a coolhead, or milled stock head, some k&n pods, and +4 timing you will be 100% happy and satisfied. Once you get used too that new power then look into doing a 4mill. Ive rode my dune ported true 350cc banshee for 2 years. Right now I have no desire too do a 4mill. I love the bottom end power and they way it pulls all the way throught the band. Its perfect for all types of riding.
Hit up Kevin at herr juggs. He is also a site sponsor and will take care of ya. just click one of his banners on this site.