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Generally anywhere from $275-500 at a shop. Try posting first on the forum to see if anyone can give you a hand with the installation or do it for you at a reduced cost, e.i. a thirty pack of beers. There are plenty of great folks here that are willing to help and are very qualified. Fellow forum member "connecticut" installed mine and did a better job than I could have expected at a shop. Also, the whole installation was finished in one day, which was a plus.
What type of headers? Some require welding others dont?
Other than that they are very simple...... I live about 2.5 hours from Philly. We can do it here if you want to take a drive. If it needs welded we can take it out to my uncles shop and all you would pay for was his time to weld.