im getting a 18" fi btl and i was wondering what are some good mids range and tweeters... what you you suggest?

 

$8.50 Boss Audio 5.25's (57-7000 Hz) on partsexpress, they look beefy.

 

massive audio ck6 and your set to compete with that 18

 

^I second Massives CK lineup. Add 100+ RMS a piece. Sprinkle with some add on tweeters if there's not enough highs. They have them in flavours up to 100rms each. = recipe delicious to the ears. Add extra mid-woofers and power to taste