I want to make 600-700rwhp (I want to run in the 10's), use my car as a every day driving car, and not have to worry about having something break under my hood every 5000 miles. Is this an unrealistic goal? I have always read that you can use the 03/04 cobras with 600rwhp as an everyday driving car if you were not getting on it all the time. Is this not really the case? I am thinking for my needs, there is no reason for me to go with the 5.4L but the only reason I thought it might help me out is that with more displacement I can run less boost, thus having less mechanical problems. I do not have a lot of knowlege when it comes to general mechanics of cars though, that is why I am asking all the questions I have been.