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depending how big the tires are remove fenderwells and all the shits thats on em, maybe tub the firewall a hair, move the wiring harness up, might have to mod the heat a/c or just get rid of it all together, modify the stock arms or get tube arms ull need some drop spinldes most likely too
the rear depending if its a 4dr get a 2dr gas tank and move it to the rear or make the stock one work with some tubing, cut out the floor, weld in notches, notch the gas tank x-member, RUN A 4 LINK!!!, cut out the stock wheel wells maybe tub them into the doors not quite sure kinda doubt it on a 18 tho
as far as 2dr not sure never did one but probably the same as above minus the gas tank shit and tubing into the door
if i think of anything else ill post it up good luck