... a crossover tube, is a small 3/4" tube that comes out of the side of some Sporty muffs and joins the two mufflers at the front end near the exhaust pipe connection... If you get one like that, you have to block that hole and it looks kinda' silly...
So,... no crossover tube...
Stock Sporty pipes like mine are baffled. but some people drill them out... don't buy a drilled out one unless you like setting off the neighbors car alarm...
They can be very loud... the stock Sporty sounds plenty good...
I bought a pair on ebay for 25 bucks... The first one burned through at 16k miles, so keep them both...
You do need to make a spacer between the pipe and the muffler, a strip of tin can works... and grunty noises help when getting the muffler to line up straight...
There are also rail and tab mounts on different HD model mufflers... either will work, but the rail mount doesn't require drilling a new mount hole and is an easier job... Mine is a tab mount... 'cause I did mine before I knew better...
Rail mount looks like this...