Lehigh Valley Tuners
It's about and hour to an hour and a half for me to get to either TTP or Rapid but those are the 2 places I will go to once my headers go on. Probably TTP only because he posts here a lot and will want to make sure an LS1tech member is happy. He also responds to emails very quickly. Mikey from Rapid I hear is great but he is brutal returning emails. I sent him one and by the time he responded what I asked him for a price on was installed on my car for 3 weeks
Of course that does not mean he does not do great work just that he's not an email guy or I just caught him at the wrong time. I like to ask a lot of questions for anything I have done on my car. 
