I get a lot of compliments, dislikes and questions in my inbox about my setup 18x8.75 +20 with Ziex 912 225/40/18, so thought I just answer some of them here. First I don't do stance so poke/flush are not what I aim for, I do visit the track a lot getting the widest wheel base was the goal. Wider wheel base rewards in better handling as I only really hit about 75mph.
Qustion 1: Do you rub and what is wheel gap like?
Answer: None what so ever, before switching to coilovers I was on the Eibach Pro Kit and it's was the sweet spot for this wheel setup. Wheel gap on the spings was about .8 inches.
Question 2: Is the poke as extreme as @
Ericpena and others makes it sound?
Answer: That's all personal opinion and only yours matters as it's your car, but taking advice from someone about something they haven't owned or had is like asking me if I think one turbo kit is better than another when I haven't had either one I would be unreliable. My opinion doe, I like it on this car with the tires I have as the actual tire tread is under the fender and only my white Falken lettering shows in front and a little less in the rear. Here's a pic I took of what the rear looks like, the natural camber tucks it in.
Question 3: Will a staggered setup work better?
Answer: I get this one the most, yes it's fine if you want the front to be more "flush". Like I mentioned I do track the car so a staggered would create a great amount of understeer that would not benefit me as this car's center is so low plus I love the oversteer

, I brake pretty well in turns and I'm not over 250hp (cars with a good amount of HP break loose quicker so wider wheels in the rear help keep it under control), on the street for someone who isn't about the "sport car" and wants a "stance car" you won't notice it at all as that's a setup I have actually driven and works really well. Not sure what a staggered offset only will do but I'm sure it's understeer as well, running +38 in front and +20 in rear will be a 1.5in shorter wheel base in the front even with the same width.
[ame="http://www.youtube.com/watch?v=z_bWWLw-60k"]Understeer & Oversteer -- AMG Driving Academy Performance Series Episode 4 - YouTube[/ame]
Question 4: Will I need an alignment for the +33, +38 or +20 offset?
Answer: I highly recommend getting an alignment anytime you change your wheels, as any change in diameter, width and offset can cause uneven wear on the tires or ride unsteady at high speeds.
Hope this helps some people, just remember it's your car so don't let others build it for you. These wheels look great on the twins no matter the offset or diameter just depends on how its executed!