there are so many variables at the track (which is what makes it fun) like brianbrave said. my family and i have tuned/built cars all my life and i personally have been racing since 2002 (not as long as a lot of you most likely). i own a forum that is all about performance and we have street cars making 600whp to over 1000whp and we meet up and race together and help each other all the time. i just pay attention to the guys that make more power with less and listen to what they have to say. i do a lot of research and studying up on what works and what does not work and what is "safe" (although any mod is a risk on a car.)
track prep most definately makes a huge difference in your times. i only wish i could have hit up the track back in april on a good track prep day when i was trapping just under 115mph with street tires/pulley/cai/tune only.
track altitude, the track itself, your tires, weight (i had a trunk full of crap when I ran), quality of gas, little things like a dirty air filter (every .0001 second counts lol) and so on. you could easily make a huge list of all the things that can affect your times.
racing and modding your car is fun and so is the competition against each other. i think it would be great if everyone was running 10's with these cars. the more that are running fast times the better we can brag about our cars. any mod that works on our cars or just cars period is a good mod. if it gains you power/speed and it works then that is great.
i have nothing agains't cruizin (other than his arrogance

) though i do like calling him out lol. arguing about mods, times, etc is all part of loving cars and tuning them. it is all in fun, i am having a blast playing around with my car and arguing what is good and what is not.
well i am out, i just mounted winter tires/wheels on two of my cars so i need to go take a shower and get ready to go out. it has snowed here for the past 3 days and today is the first day we have had nice weather so i am going to hit up a movie/dinner and some shopping (yuck).