Bomar'sC5

Just picked up a TSP Long tubes with O/R X-pipe kit for my 2003 Corvette. Got a decent deal on it I feel, as I only paid $290 for it. Its in great condition and even came with wide band bung already welded in and o2 sensor extensions. Anyone have experience with this setup? the x-pipe is a true 3in and I'm going to button it up to Billy Boat cat backs.
I also found out that my car came factory with an LS6 intake already on it as well! (sorry I'm new to the vet world and LS) So luckily i didn't spend the money to purchase one used!
Cam kit and porting and polishing the stock 741 heads is next then cold air intake and then i'll take it to get dyno tuned.
Trying to squeeze 400hp to the wheels. What do ya'll think...Realistic??
thanks for any input !