Can 20's fit on the 300's? And if they can how much can you lower one?

 

yes, they'll fit. just get the right size and offset. lowering an inch should be perfect

 

Lowering an inch or so will give it a full look in the wheel well? I don't want any gap... so do I need to get some coilovers or are the eibachs good enough?

20X8.5 5-114.3 35C... look like the right numbers, eh?

 

I have 20 x 8.5 Niche rims wrapped in 245/35/20 P-Zero's. I had to roll my rear fenders cause it was rubbing. Performance of the vehicle is greatly reduced, so keep that in mind.

 

[Performance of the vehicle is greatly reduced [/B][/QUOTE]

Why would you want to spend big $ to REDUCE your performance???