WHAT TO DO Manifold/Header exhaust options

What is the primary use or the car ? Best fit is Dougs or TTI , make good power . I used block huggers Hedman decent clearance , make enough HP for my purposes , give up 10 HP on the top compared to TTI . Engine had 394 HP 413 TQ on the dyno . Might run better with TTI or Dougs though , it's not critical for me , maybe it is for you .