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Thanks guys the opinions and advice is very much appreciated. I want to go with 4.10s but I drive about 75mph to work every day... What do you think?

I have a 2006 Gt Auto (rather have a stick but this is what I've got) and I am planning on sticking with N/A. My plans are to put some inexpensive longtube headers, an offroad x-pipe, CAI, underdrive pulleys, and a tune. My question is how much power will these all together produce? Whats the...