Hey all i have a 02 gtp and need to get a cali smog check to get base tags... *bull**** when i have washington plates* but getting a stock tune pcm back in the mail and going to put the stock airbox in. but with a tuned pcm and fwi the NOX levels where off the charts. any idea if stock air box and tune will fix that? if not know of what i need to check to fix it? thanks!