More than likely a simple drain & refill of the hydralic clutch fluid will fix this problem. All us guys that have modded out car experience this all the time, as HP increases, heat increases, fluid degrades, pedal sticks to the floor. BTW, there's not a simple way to drain the fluid.
This is a very widespread problem, especially with people who have added power. Please, ask some hard questions with the dealer & post the answers, everyone would appreciate the feedback. There's another thread running right now addressing pretty much the same question w/ as of yet nothing for an answer.