I used to remove and then punch out my baffles on my Shovel with a spud bar or take the baffles out & leave them out, then drill the pipes about 6 inches up from the tail pipe end, and run two bolts in a cross hairs manner inside the pipes so the police couldn't run their batons inside the pipes when they checked for straight pipes. Even on my shovel it required rejetting, plug type changes, etc.
I would not recommend doing this on the newer EFI engines.