Dynomax 39447 Ultra Welded on DC LB

I'm thinking about ordering a Dynomax Ultra Welded exhust (part number 39447) for my 2012 Tacoma TRD Sport Double cab and Long Box. However, the website i want to order it from says it only fits a Double cab with a short (5 ft) box. I believe this is incorrect, in that it actually comes to fit a DC with a LB and it needs to be cut down to fit a short box? Does anyone know if this is correct? Just want to make sure before i order it only to find out its too short.

Thanks

 

You may get better responses by posting in the 2nd gen section. 3rd gen is MY 2016+.

 

Sorry, my bad, i intended to post it on the 2nd gen