2 Questions?

[902066]

I have Stainless Works headers, no cats, Flowmaster Force 11 cat back. If I wanted to have the system welded, so the end exhaust tips don't turn anymore, how much of the system should be welded. All of the connections, most of them, just the last ones on the far end?
What are the signs you need a new power brake booster? Brake pedal is very firm, barily feels like power brakes. If new booster is needed where to get one? 90 Z has 10,000 miles on it.