Deciding on what to buy
 

Is there any companies that sell front lips or anyhting i have a dent on the bottom of my front bumper and there are scratches on the bottom also trying to figure out what to do

Also can people post up some of their pictures of rear diffuser and brand

Front lips and rear diffusers are 2 of the most often discussed mods...a simple search will bring up hundreds of posts and pictures. Hell, even a google search of g37 lips/diffusers will give you what you're looking for