engine harness for the loom with a motorsport quick release pin on the firewall. relocate fuse box in-cabin as circuit breakers. relocate battery to the boot. get rid of all of the standard cannisters for fuel, breather and purge valves. fabricate new washer/fluid bottles and all header tanks. replace intercooler hose clamps with adel wiggins couplers and lastly, add carbon fibre for airboxes and other covers.

and if you do this and run out of ideas, engine out, smooth and weld holes you no longer need and then paint.