its suppose to open up after reaching a certain psi, whatever its set to, thats when you hear a poping sound. It sounds like you need to check your intercooler piping. a coupler could have came off. It happens alot when boostingthat must have been the loud pop i heard when i was driving. after that, it didnt boost anymore. so is it good if the wastegate pops like that?
a 'cheap' DIY alternative to using metal IC piping is using PVC piping that you can buy from any home depot,etc store (if you dont have a welder). It works good, and is a good 'heat' insulator but it doesnt look the best (although better than any wet/dry vac tubing LOLthanks man. thats exactly what i was looking for.
hmmmm,it could be staying open but if you've got a dump pipe that runs back into the exhaust normally you wouldnt hear it. IMO it'll be worthwhile on your part to pull it off and take a peek. I'd get some proper charge pipes made up for it though, you're playing with fire using we/dry vac...well i got my wastegate dump pipe welded into my exhaust the other day and my car started boosting again. i was driving it yesterday and i heard the pop/thud again and now im not boosting anymore. could this be the wastegate popping and staying open?