Actually you luck out you can get incar tune from overkill, but do that after your mods. :: Overkill Motorsports ::
for losing low end with headers and hv3 that is true, which is why I went with my downpipe instead of headers and will be getting a Power-log(from ZZP) in the spring so no low end trq loss, but its pretty much the same price as headers. and i can turbo one day if I really want(cant turbo with headers)