About 300 rwhp and about 300 lbft of torque at 8 psi at 70 degrees ambient and 3500 ft elevation. I have had logged as high as 9.5 psi on a cool day up here but I that is about as far as I will push it on an NA fuel pump and the 370 injectors. Others have tried to push further and failed. Torque curve comes up faster and is flatter than a "normal" TT. Top end speed is obviously lower - completely maxed out at 135 mph.
Was it worth it? It depends what you want - I like the midrange power and torque down low. I like the low end acceleration. I rarely drive over 100 mph so I don't miss the top end. It is a very "streetable" setup. Also learned a ton about these cars through the process.