are there any ca legal headers that offer any performance gains? i have always heard long tubes are the way to go and shorties are for the most part no improvement over stock. i want to build my own full exhaust (header back) and make it all offroad,(swap catted mid for smog) the midpipe isint a big deal to swap for smog but i dont want to be swapin headers for smog. so are there any out there that fit the bill or are the stockers the way to go if your in ca? thanks guys