You can get a inline 5 in it cause I know you can fit a o7k or a vr6 lol. my plan was to swap it to a TDI I actually have an 01 TDI sitting here for it just don’t have the money currently to finish it but once i do, this TDI is actually supped up some pushing 20+ psi of boost not the I will probably run that much since I plan to daily it but it can