Cool, glad you like it. Mine has been a great car. My wheels are actually aftermarket, I just have Honda centercaps to keep a little bit of an oem look. Wheels are 18x7.5, tires are 225/40-18 Yokohama AVS ES 100 tires, a summer only performance tire.

No, you don't need to modify the suspension to fit the wheels, but the problem is when you run a large wheel you want to maintain the same basic overall rolling diameter, which means you will have a shorter sidewall tire (some call low-profile). The shorter sidewall gives an illusion of the car now being lifted. It's because in stock form, you have about the same amount or less wheel gap compared to tire sidewall. With the larger wheels and correct size tires, you end up with more wheel gap than tire sidewall. This gives the illusion of the car being lifted.

So you really want to lower the car before adding tires larger than...maybe 16". 17" starts looking funny to me, and 18" is definately a no-no lol.

I would recommend doing the suspension first just because then you don't end up having that lifted look at stock height. I love my suspension because it just makes the car a lot more fun to drive. It's a bit more stiff than stock, so if you want a cushy ride, you might want to stick with the stock suspension, but you can lower the car about 1.5" or so and still maintain a decent ride.

Here's an example that shows what I'm talking about. This is magnified by the fact that this car also has the wrong size tires, they are too small in diameter.