Not sure what size tubing you are planning on using.

You could use a 292 exhaust manifold that has a 2.5" outlet.

The stock 2" manifold is not even 2" when you measure the outlet.

Example: http://www.ebay.com/itm/New-John-Deere-E...=item5d4e97b432


http://www.ebay.com/itm/250-4-1-292-GM-C...627&vxp=mtr

MBHD

12 port SDS EFI