Newbie with questions! Wheels, exhaust, resistor

Hello one and all. I have owned my 96 polo green svx for almost 3 years and 30k miles, and love it. I have perused and enjoyed svx.net since before I bought my car, but did not get around to actually until a couple of days ago.

Now I have a couple of questions for the gallery:

1) Larger wheels. Those of you who have switched to 17s or 18s, did you really notice much of a handling difference? I have Yoko AVS dbs on my car, 16s and am debating changing wheels now. btw, the Yokos were quieter, but a bit disapointing in tread life, about 20k miles. The original Potenzas lasted 45k.

2) Same question for exhaust modifications--any real difference?

3) What do you think of this resistor mod on eBay?http://cgi.ebay.com/ebaymotors/ws/eB...tem=2428040579