If your 165's are name brand, sell 'em on eBay! Or, buy another set of rims and keep 'em for a car show day.
The tire store I went to offered to install one 195 and if I didn't like it I could've gone to 185's. I couldn't resist the meaty 195's.
I forgot to mention the HUGE difference these 195's made! My GTV was so wiggly with the 165's. I now have great grip and stability.
Glad I could help!