-well if you look to your left you will see the banner for mvp motorsports, from what i understand they are the same as powerhouse racing, mvp is the online shop, and mvp is the garage that builds the cars.-for alamo, go to
http://www.alamoautosports.com although they dont really update their website that much, it will give you their phone number and address.-for projectsilvia.com they have their address and phone under the "contact us" link, also notice that they are having a meet this saturday, i myself am going to check it out (but not participate, my 240 is stock), i recommend you go do the same-i also hear that CTC motorsports in dallas is veryyyy good, but no personal experience, on 240sxforums.com dne (the leader of dallas nissans enthusiasts, website is nissans.org) says that they are the best, but he vouches for alamo too.about cartunes, the only thing i have heard is one bad story, but i dont know the details. notice that the swap will take longer than expected, realize that this will be true for ANY project, you will run into unexpected, nothing will go 100% as planned, but you shouldnt be waiting TOO long for an install, if you want my opinion dont pay all up front, just put a small down payment, especially if you cant see the sr with your own eyes, so many people have gotten burned by just giving a shop thousands of dollars without the shop having the parts.