I am about to do the same to my 2009 GT-R I recently acquired (13k miles), which 800 kit did you go with?
How funny I literally have ordered almost all those parts over the last few days as well as Cobb AP and Visconti Flex-fuel kit (as well as their twin pumps, hardwire kit, and 1300x2 injectors) The only thing is my mid pipe is 3" and my cat back is from a NISMO model (Car came with Nismo seats and exhaust from a late model Nismo GT-R) Do you think I should upgrade the cat back?I ran [email protected] with the older version on an aggressive 93 pump tune. The newest version has the UHF turbine wheel so it should flow a little better. I recommend the following supporting mods...
ID 1300cc injectors
Twin 485’s w/hardwire kit
Cast bell mouth SS downpipes
DBA inlets (ported)
Upgraded MAF or SD kit
Race intercooler w/ 2.75” upper pipes
You can pick up many of these parts used and in good order on the FacePlant forums for cheap. You’ll also need to make or buy a fuel pressure monitor kit and ethanol sensor kit.