Also remember that when discussing brake swaps like this, the subject of wheel spacers almost always comes up, as they are usually required. In my case the fit was so close that the wheel scratched the paint off the calipers. I sanded them and repainted and ended up with clearance about the...
Make them. There are dimensions in these threads:http://www.dsmtuners.com/forums/articles-suspension-brakes/185350-guide-13-1-4-piston-brakes-1gs-cheap.html
http://www.dsmtuners.com/forums/handling-tech/184965-bargain-basement-big-brakes.html
From the math, you would have about the thickness of a penny for clearance on either side of the tire. Unless you can test fit them before purchasing or you are prepared to deal with rubbing by using spacers or aggressive fender rolling or increasing negative camber, it would be better to...
http://www.dsmtuners.com/forums/frequently-answered-dsm-questions/286685-will-these-wheels-tires-fit.htmlThose wheels will fit with no problem whatsoever, but I'm thinking you might want some rubber on them. That's where things can get tricky.
245/40/18's are BIG tires, diameter wise. The would fit with fender rolling but 245/35/40 might be better. If you want to avoid fender rolling, stay with the 225/40/18's.
Lowering doesn't change any of the clearances. Changing camber after lowering does but only at the fender. With that high offset, you've got enough clearance at the fender for a __________ (fill in appropriate humorous noun).
If you had looked at this thread http://www.dsmtuners.com/forums/frequently-answered-dsm-questions/286685-will-these-wheels-tires-fit.html you would know that there is no way you would fit 255's on those wheels. I'd say 235's are the widest you can use without complications.
You should start by estimating your correction based on the amount of suspension height change.
http://www.dsmtuners.com/forums/handling-tech/168194-question-about-camber-toe-camber-kits.html
That should put you in the ballpark. Otherwise you should get a bubble type camber gauge. Habor...
It is generally felt that that that is not an area that requires reinforcment. A strut bar on the top may stiffen things a bit if you have a sunroof. It's the torsional stiffness that is lacking and there isn't much you can do, short of a roll cage, that will improve it.If you are set on...