I was told they will hurt my torque... is this true? Will my top speed be increased then? Just want to know your guys opinion. thanks.
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taller tires help top speed, but hurt take off speed. it changes your final drive ratio. it basically makes your gear ratio seem like a numerically lower ratio.
i assume that you had a 5 speed with 3.55s. basically if this is true, it would be about the same as using the stock wheels with 3.34 gear ratio. (standard 05/06 automatic and 07 ratio is 3.31) it would slow you down a little. the difference would be in the tenths, so not a huge deal unless you are trying to get the fastest ET possible. but you could fix that with a gear swap.
if you installed 4.30s, the effective ratio would be 4.04, very similar to stock heigt tires with 4.10s.
I'm running 295/45-18s and they are 1.5 inches larger than stock. I have 4.10s and like bigcat said, my gears are like a 3.90 which is still a great gear for the street.
hard to say. taller tires reduce gear ratio but improve hooking. theoretically you could see big improvemetns with a taller tire if you can get better short times.