You can get about 10 psi from a 33 turbo fairly safely, if you buy another 33 or 34 turbo you can hold out till your current one shits itself then swap it over.
Yeah, thats after I cut it back to 720p so it wasn't too big. They are a little on the pricey side if you just want one to film round a track but well worth the money if you want to also film more extreme stuff.