As stated before, you might want to do intake/exhaust mods first. I too am trying to work my way up to the turbo kit but you should do some more minor engine work before you move on to the big leagues. Personally, I have a long way to go. Here are some contour sites that have served me well. They both have fast shipping and great customer service
www.ctamotorsports.com www.spmotorsports.com Of course you can look around price wise but this is just a start. Good luck