If your car is slammed you probably need your fenders rolled
this is simple enough to do on your own, but it helps to have a friend around
You will need:
-wooden baseball bat
-heat gun
-case of beer
Steps:
1 raise your car a little bit and tear off the rubber/plastic liner in your fenders. Should come right off
2 put the bat between the wheel and the fender and make sure it barely fits
3 heat the lips of the fender, but not too much as it will make the paint bubble
4 put the bat underneath and add a little pressure on the handle. You should see the fender edge bend up a little bit (1mm or so)
*5 go all the way around the bending the edge a little bit
6 keep the area you're working on hot to prevent the paint from cracking.
7 once you got it started, raise the car a little bit, and do it again bending the lip in another 1mm
8 you can see where this is going... keep doing this until the car is all the way in the air and you got the lip bent in as far as possible.
9 if you need to bend the lip in further, turn around and use the handle. Place the handle against the bent lip and put pressure on the head of the bat to push the lip towards the fender even further. At this point, it's a good idea to have the ebrake off and the car out of gear so your wheel can rotate freely. Doign this will allow you to get a nice smooth edge on the bent lip.
*if you have a buddy with you, tell him to get in and very VERY very slowly drive the car forward
-you should heat the whole lip of the fender apply pressure and ROLL the bat as the car moves forward
just do it slowly and you'll get great result. Take your time and do a little bit at a time. It should take you at least 30min per corner if you want to do a good job "this is why the beer is needed"
Here are the illustrations:
summary

getting started "after heating"

just a bit higher

all the way up

using the handle



nice and smooth

now bring your coils all the way down & hit the streets