which one do you prefer. looking for opinions. i am looking to get a exhaust system and i have narrowed it down to this. also trubendz has 3". i have been reading 2.5" is most preferred and i havent seen anything mentioning 3" exhaust. i do plan on putting a turbo in, but that is in the future. would 2.5" or 3" be better if i go with trubendz.