New Tires Put on Today
I'd also recommend an ls1 intake swap over the headers. You'll see better gains and it's a little bit cheaper. I have about $350 into mine.
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Run a search on tires - we have gone through countless tires over the past 5 years. Stay away from the V grooved tires - they make way too much noise.
I have those same tires and the road noise drives me crazy. Can't wait for them to wear out. Performance wise, pretty nice just really, really noisy.
Road noise is really negligible. I'd look into that if you have noise with them.
I just think they are excessively noisy in my car. 

