does any one know where i can get performance headers for my v8 2000 ls

there is not any on the aftermarket. I've taking my LS to three local shops - they all turned down the business to make one. it's such cramped quarters and the headers are so short they didn't think there would be enough of a hp gain to warrant the bill to make them.

Honestly, having just recently been under there, I would bet that a mid-length header could be fit in there if properly designed. Personally, I thought there was quite a bit of room in there. The stock manifolds don't look too terrible, but a set of headers would probably really wake the LS up.