rattlin sound

hey fellow X-ers,

Hey, in the past few weeks, on a cold start-up, my engine seems to be rattlin. After my engine warms up, it disappears(5-10 minutes of drivin). I did my best open the hood and check for any lose bolts, but haven't done any mods other than K&N intake. Hope you all can help me out, or might have to take it to the nissan shop and get crazyily charged. Oh by the way, my 5spd X only has 33K miles and reguarly keep up with scheduled maintanence. Thanks in advance.

So many threads on this its absolutely amazing you asked! First...do you have oil? Do you have quality oil? Correct weight? Quality oil filter? Anti-drainback valve? Read my friend, READ! Then ask, if necessary!