it sounded like a GIANT blow-off valve
So last night i got the munchies at like 12 so i was making a run to the store and it was raining (it's seattle). I decided to floor it and listen the the wine of the tires on the interstate on ramp. the tack hit like 5500 and the spedo went to like 60 when i was going around 25...and then i heard a giant release of air or pressure of some sort. on the way to the next exit i heard a faint grinding/hissing sound and i couldn't tell where it was coming from (it sounded more like a hiss, thinking right away it was a tire i looked all around but they were all fine). I hopped off the next exit and checked everything in a parking lot. I was thinking maybe it was the dif but i drove it around and it stopped making the noise after i was in the parking lot for like a minute. it seems to run perfectly fine and it just really scared me cause i thought i blew something big (or maybe i did)...what do you think? I really could not think of anything else. 
'99 5.3L Silverado
Interior: 3 10" Kicker comp CRV 600w (2 mounted in custom black suede covered console), 5" tv mounted in the rear of the console, DVD player in the glove box, Hifonics 1200w mono-block Brutus Amp, Blue under-seat lighting with blue lit dash switch, Paint-matched dash
Exterior: AEM Brute force CAI, custom Flowmaster super 40 cat-back before tire dump, Shorty headers (Wrapped), LS1 Hotcam with a top-end rebuild @130K, Nelson tune, paint-matched SS bumper cover, Billet, paint-matched mirrors, painted stockies
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Originally Posted by r6z4o6
