Which y-pipe is needed for the :
hedman 1 5/8 Long tubes?

Part #: HED-68460

I know i'll need an off road y-pipe but I don't trust the exhaust shops around here enough to make one and have it routed correctly, they'll cut corners and what not.

 

there is not one available. most people who run these headers use the hedman universal X-tensions and then run true duals, but there is no reason you couldn't run the X-tensions and then some mandrel bends to a flowmaster 2 1/2" in 3"+ out. either way, it's gonna be custom and it's gonna reduce ground clearance alittle. here is a pic of the ground clearance on my cars, right at the X-tensions (which will be your lowest point). obviously this is a true dual setup, but it will show you what yours would look like. where my h-pipe is, just put your mandrel bends and y-junction.

oh, this car has v6 springs up front and no spring isolators in the back with factory v6 springs out back and a 28" tall tire.