no worries racer
I must get the standard chassis on to compare some time, wouldnt mind trying the 2mm as well
I bought my car wtih the 3mm already fitted up...
A wise investment also is 75144 Pivot block spacer set beacuse the thicker chassis plate will effect your roll centres because the pivot blocks will be .5mm higher than on the standard chassis when you use a 3mm. the pivot block set includes 1mm plates so you can use a 1mm and 1.5mm where you would have used a 2mm normally for instance. Or just a 1mm in place of a 2mm for a setup sheet that uses the 2mm chassis. This will keep your suspension geometry the same.