do i need a 496 y pipe
 

i swapped a merc 350 bravo drive with a 496 my original y pipe is 26 inches wide but the 496 is 29 inches wide will it fit or do i have to change the y pipe absolutly . everywhere i look for info some say it will fit some say it won t .can someone help me with the right answer please

With a few adjustments it should work.

These two guys made it work,
http://clubsearay.com/archive/index.php/t-29685.html

http://www.boatfix.com/merc/Bullet/00/00_13.pdf