During recent all-day trip (Utah to Florida leg), my Honda Pilot 2003 provided loud cracking sounds leading me to believe that major destruct was occurring someplace forward of the firewall. At times this disconcerting racket sounded like an idler pulley disintegrating, bearings being chopped, ground-down, etc. At other times quick, snapping sounds could be likened to a bungee being snapped against the dash, at other times resembling the disconcerting sounds of snapping metal rods,etc., foretelling a heartbreaking breakdown...someplace. Nothing! The car kept rolling beautifully. Regular inspections under the hood, wheel wells, and under the car revealed nothing. None of this disturbing racket occurred when car was standing; slightest movement though, causing it to act-up once again. At times during this particular day's driving the Pilot curiously drove nicely and quietly...no panic! Yet, expecting the same noisy racket during the next day's driving the car was nevertheless quite docile...not a peep, nor has there been back home here...great! All operating criteria remain normal. Now, how about this? The day before this trip the windshield was replaced. Although the car moved quietly the first day of the trip, we see that it acted-up the next, as described. Is it possible that an improperly installed replacement windshield somehow managed to noisily realign itself the second day as wind forces and chassis movement possibly provided? I suppose that what I've described is not necessarily a Pilot experience; but possessive of something in common with general windshield replacement problems if this is indeed the answer. What ever. Comments definitely appreciated. Richard Pensacola, Florida