How much can she handle?

[1slowdsm]

I'm just wondering how much my/our cars can handle with a stock motor and minor bolt ons. I dont want to go and break anything anytime soon on my car so I have a few questions. I have a 2.5 dp, 2.25 testpipe back, 2.5 exhaust, air filter and MBC. No modifications on the motor yet, so how much would it hurt to be boosting up to 20 on the stock turbo and motor? I'm not purposely boosting that high, its just that my MBC spikes all over the place and there is never a constant boost throughout the gears. I just had a 20 lb spike and a constant 18 lbs on the highway when I did a 65 mph downshift to 3rd to see how bad it would spike. But most of the time, the boost would be at 15-16. I know the motor is pretty strong stock, but how much can it take being stock? And how much could the 14b take being stock also? Like I've said, I didnt plan on it being so crazy...but thats just what I've had the past few weeks. I only really beat on my car like once a week, other than that, its just normally driven. Sorry if this doesnt make much sense.

How bad is it to have a whole in my downpipe?