Rx-1 muffler or Apex muffler

[4x4]

Is there a difference in power between the Rx-1 muffler with the x crossover and twin pipes or the Apex 2 into 1 design?
Will either fit the same Y pipes?
A difference in total length or exhaust cover fitment is not important as the rear of the sled will be modified, thanks.

 

[grader]

if fitment is not an issue then go with the apex system as i think it had a few more hp than the rx system.