Custom jb4
 

Has anyone customize there jb4 with the N63tu motor what were your gains and how can I get mines custom I have ********* and the jb4 nothing else but want a few more horsepower out this jb4 which I know It can do and any suggestions on what to get next other than meth injection for more power I’d appreciate it

Best to post a log for review and go from there. We can't really offer any advice without that. ;)