Does it look similar to my setup here? I have a Garrett on in this picture but its still the same style as the original GKIT. The issue with teh Gkit is that the turbo is to small and it creates so much heat that it causes issues very easily. You will detonate easier then other sleds running the exact same boost simply because of heat. You will also be heat soaking the entire engine bay even with very good venting causing power loss and other potential issues. Along with heat issues from the small turbo you are also making less power since you arnt pushing as much air as a larger turbo. SO what that means is you need to run higher octane to help battle the heat issues and you are already making less power then a sled that needs maybe just a tiny bit of race/av gas or even straight pump. So youre making less power and spending more money on gas.
If youre willing to do the work to put a different turbo on id say go for it, the kit has a ton of potential you just need to get past the turbo itself. After I put my garrett on it was an entire new sled. I ran 8psi with the old and new turbo and it was night and day difference, it ran so much cooler, made way more power, and all I need with this setup is a splash of AV gas for longer pulls.
EDIT: If you do end up getting it make sure you do a cold air intake, its made a night and day difference for me