First off, I have a slightly modified 07 WRX TR (3in. cat back, and STP cold air system). My question is at what RPM is the optimal launch point on a prepared drag strip w/air temps around 85(+/-). I launched at ~4000r's and it was a bit sluggish, and then at a bit higher ~4500-4750r's and I began to notice a burnt clutch smell. Since tonight was the first time I have ever ran my car, I really don't know what to have expected, and I didn't think to ask before I went. I would really appreciate any feedback given, Thanks in advance.