yes. do that and also your head and exhuast port could have a decent amount of carbon in them. so could your pipe, and changing that could help. not to mention the performance increase from the expansion chamber. unless you do decent modification to a tomos the bottom of 2nd usually has no power.
don't listen to people who say this and that about jets. it all depends on where you live and your elevation. ALWAYS buy a range of jets when doing engine modications and do plug chops to get it right. and also remember your engine burns richer as it gets colder outside.
now for the opinion. for a little more money, the tecno next is considerably better in all aspects then the bullet and biturbo exhuast. I can say this from true experience.