Anyone know of any decent standalone management systems out for our cars

That one day, I can buy a wrecked GTR and put the driveline and interior gadgets in a flatsider starquest, but with a VK56VD v8 with two 6266 ball bearing turbos on it instead of the stock 3.8tt motor.   Some might say impossible. But the only thing that is impossible is something you can't dream up a solution for.

I currently have a .82a/r turbine housing. I want to swap to a smaller .63 or a .49a/r.   would I have to modify the downpipe just because the smaller AR? or the AR will not change the position or location of the downpipe.   Thanks,

bought 86 for the 89 seats he had for it...........(would not sell seats with out car) ...injectors werent firing...Cleaned eng bay 20 times..................#$@#@@%@#@% and turbo washed eng bay ..,let dry out for a day...Tried to start the next day and soinoid got stuck and burned ECI fuse link..Put new one in and as soon as i hooked up battery.... burned another one...put in new starter..problem fixed...Cleaning around diss and took cap off to clean and found out that diss is worn out....