Toyota Celica 92 WRC Model. What Modifications can i do ????

GDAY EVERYONE !!!!!

Second time post ha ha ...

As i was saying ...!!!!!

I have a Toyota Celica 92 WRC with all the trimmings.
electric windows, power steering, sun roof, spot lights.

Its a 2.2Lt Twin Cam 16 valve EFI and it hammers ok.

I have done some serious 300 000 KMs on this sucker but worth all the while and distance crusin the hightways.
I had a recon engine at 150 000.

My muffer just went so i ... ha ha went the hole hog and got a extractors, muffler, the hole kit right through. its sounds much better now and i can feel the performance a bit more lively.

Its been tunning and serviced regaurly and is in good condition.
i got it for a 21st present and twice i could not sell it.

I love this motor car so much.. is the best pop up lights and all cool
so i have decieded to upgrade the engine like new racing cams, headers, fuel injection or maybe put turbo in it.

Maybe new head gasket, brakes, flywheel pistons and conrods, sway bars, oil filters, drop tank etc....

DOES ANYONE HAVE ANY IDEAS OR HAVE GO THROUGH THE SAME PROCESS HELP ME PLS ......

thanks need help ....
RIK.....