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well not too many easy and inexpensive options to make it faster since its an xi and naturaly aspirated but:
headers back exhaust, intake, and a tune will be a solid way for a better flow of the car and of course make it sound better
there are supercharger kits out there for that motor, but its expensive to do all around
id do some coilovers and a nice like 18x8.5 wheel setup all around for sumemr and still have snows for winter so you can fuck shit up
roof racks make sedans and cars in general look sexy so do that first
throw on lowering springs, or coilovers if you want to dish out the cash, but seeing as you have to pay off the car i dont think you will have the extra 1-1.5k. and do a cheap exaust or straightpipe.