I just put in some flowtech headers, and re-did the entire exhaust, however when i finally started it back up it ran awesome, and then after maybe a minute or 2 it starts to leak around where i ran a crossover from the drivers side to the passenger side. I'm just wondering why it doesnt leak as soon as i start it up, theres a hesitation for a bit then it starts to leak..what does that possibly mean, if anything?
-brAd

1988 F150 302 4WD
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i'm not an expert on exhaust, but i'm guess heat is causing time delay.

are you using clamps or are all the seams welded? if clamps, this isn't unusual i don't think.