i know there are alot of topics out about these but i wanted to know is good to go with the 4k or should i go with the 5k? also would i need to upgrade my fuel supply if i went with the laser cut dvs. i have a #0 plate a 5inch exhaust star wheel cranked. even with the 5inch do you think shed run hot? i am looking @ a turbo soon:hyper:. thanks