I know quality comes first, but rite now i only have basic bolts on...nothing big. Most likely even if i plan to do something serious to the motor, it won't be NA.....Supercharger is the only route i am gonna go. For now i was just asking if i had the opportunity to swap my 4-1's out.....should i do it? Oh btw i really don't that much of mtn runs or Autox runs so i guess sticking with 4-1 for now will be a good idea, but when i do get enough $$$....i'll upgrade to better headers.