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with proper suspension 19's aren't harsh... I had a set(came as part of a deal) of 20's on my GT2 for a week without issue
have been thinking of going to 19's for tire selection reasons
My only experience with 19s was when I test drove one that was stock but with 997tt wheels. I was driving a lot of 996TTs at the time so had a good basis for comparison--it felt like riding on Fred Flintsone's rock wheels. I'm sure it can be made to ride ok, but wouldn't recommend just slapping them on a stock suspension.
Don't do 19s your car will blow up...;-) Mine has been fine for 10,000 miles. I went with 245/35 and 305/30 in s04 Bridgestone and they ride way better than the hankook v12s the PO had on the factory 18s.