I am building a custom exhaust on my Countryman All4. Just behind the rear axles, the exhaust splits with a Y into 2 separate mufflers. My question is, after the Y, do the pipes leading to the left and right mufflers need to be equal length? I know when pipes are converging equal length pipes make a difference for scavenging and such but I don't believe that after they separate it is necessary? I feel it may just change the exhaust note a bit as the pulses will be timed differently exiting the pipes so it might have that Subaru type of burble. Your thoughts?

 

Might want to use the milltek exhaust as a guide. They pretty much come back to the barrel at the same angle then go into is side the same.

https://www.ecstuning.com/b-milltek-sport-parts/turbo-back-exhaust-system/ssxm400~mll/


This is the underside of the CM stock exhaust.





Doing the different lengths might change the tone a bit and make it two-toned.