cutting a hole for a stack

[GeorgiaDuramax]

I would have to agree with a whole saw being the easiest way

 

[RENODMAX]

Remember to use low speed and some cutting fluid too it will help alot.

 

[darkness]

Angle grinder with 4" cutoff wheel.....only people with big cajones do it this way

thats how i cut my hole. moving the stack back to miss the crossmember is a good idea, but the way you want to mount the stack to the bed will also determine where your hole goes.