I'm installing headers and used the FAQ guide. Everything has gone very well except for two things: Anyone have a suggestion on how to remove the front engine mount bolt. I can't seem to find a way to get enough leverage to loosen it. And, where's the best place to get an OEM O2 sensor for a 1996 (rear exhaust header if it matters)? It looks like whoever had the car before me installed an aftermarket version and spliced the wiring with the connector - plus I can't remove it from the exhaust manifold anyway. Thanks in advance.