ok i have a cold air intake colder plugs and im ganna eather put a 160 t stat or 180 what one should i run and i wanna drop a pulley size i have stock wanna go 3.4 can i do this safe with stock pcmi dont wanna hurt it ima get a new one just not yet and can you cut the cat off wit out tripping the o2 code if you could help that would be great