At the top of the SVT Performance Section there is a thread that will answer 98% of your questions in relation to SVT Perfomance.
New Members Read Here First. SVT Performance Chat "Read First" Threads
Trust me when I say this, most of your questions about your SVT have already been answered 11tybillion times, so please use the search function before you start any new threads.
I personally have spent hundreds of hours searching and there has only been a handful of times I have had to start a new thread to get the answer I was looking for.
As far as your "get more horsepower" question, this thread is for you...
SVT Performance Upgrades
Oh yeah... welcome to FocusFanatics.