Hello. Heres the deal. I have a 90 Ramcharger and I want to free up the intake and exhaust. Any suggestions as to what may help.I know that true dauls but living in calif Thats a no,no still have to smog it ,But I was thinking of increasing the tube size from the manifolds to cat, put Hi flo cat on then increase size again to muff and either single out or dual out .but I have heard that TBI engines dont like changes,can the comp be reprogramed or chipped . Oh on the intake side just a low restrition a/f.