I recently bought an Ultamite Racing Turbo back w/ v2 catless DP for $550! Now my buddy wants the catback and racepipe for $450. I currently have stock dp, 2nd cat and res. delete with stock pipe and muffler. should I just install the UR dp and sell the rest??? I know 3in all the way back is ideal but im stuck on the fence. What do you guys think????