There are many brands of high performance and racing oils available. All of them behave in different ways, and yes...there are some that will increase the power of the engine...temporarily only!!! The gains will go away as the oil breaksdown and experiences cycles.
For a daily street driven car, I use Shell Rotella T, 10W30 oil (non-synthetic) or Shell Rotella T 5W-40 (Full Synthetic). Yes, it is a Diesel engine oil, however, it contains detregents to keep the inside of the engine clean, and also has a higher contents of Zinc which helps all friction surfaces such as cams and bearings. If you switch to Rotella for the first time, you will be for a surprise since the oil will darken due to the fact it will disolve and remove any old sludge. So, if you switch to Rotella for the first time, do two oil changes at 1,500 miles. After that, switch to your normal schedule. You will be surprised when you remove the valve covers and intake and see a clean engine with no sludge.
For racing only, I recommend both Redline and Royal Purple.