if i get 18's will i have a big gap from my tire to wheel

yes

well i want to get low profile tires but not to extreme.

you don't have a choice

also if i get 18 can i get away without lowering my car bc i dont feel like scraping everywhere

no

also how will the 18 effect my speedometer

not with te right tires

and finally what width can i get i dont want anything sticking out the sides

225 40 18 or 215 35 18 the first one will be taller and less "extreme"

if you want less extreme go 17's. plus tires will be hella cheaper

http://www.ocaddict.com

thanks beefgg for the sig