Wheel Spacer Questions

[Trust33]

heya.

i just bought myself a set of 4 mazda astina 323 alloy rims for the rear of my r33. stock rims are 6.5" with a 40 offset. and the astina rims are 6.5" with a 45 offset. they clear the rear callipers which is good.

i was looking at these 5mm wheel spacers:-

http://cgi.ebay.com.au/FLYING-TURBO-5MM-RI...1QQcmdZViewItem

1- should i use a 5mm wheel spacer to get them back out to stock stance? are there any real noticeable bad handeling characteristics that the car will have from not having spacers through just running with the 40 offset?

2- are they any good to be drifting on, on the rear.

3- also is it better to push the rim out further to make the track wider at the rear?

4- should i be doing the same at the front as well?

5- i might have tie rod spacers on the front also. so will this mod affect things like the tyres touching/scrubbing on parts? taking into account that with the tie rod spacers they dont scrub.