408 with tti's. Do I go with H or X pipe exhaust

I have an x-pipe with the new 2.5" system that is under my 360 powered 68 Barracuda. Prior to that I had a 2.25" system with an H-pipe. By the butt dyno there was no difference in the power and the engine makes around 370 HP based on 102 mph trap speeds in the 1/4.

The biggest advantage to to either is the noise reduction. They allow you to run a less restrictive muffler and keep the racket down to an acceptable level. To gain any real power advantage they have to be positioned correctly and in 90% of the installations they are placed based on where there is room.

Since installing the system with the x-pipe I have had to remove my tranny twice. The x-pipe is a definate disadvantage there, you need to remove the pipes from the mufflers forward for clearance.