I'm attempting to do the BD Exhaust manifold install. Only problem is, I can't seem to find any way to get at and remove the three bolts that hold the exhaust pipe to the exhaust manifold.

The one bolt I can get to, doesn't want to seem to budge and I'm afraid I'm going to end up rounding the bolt head off if I try anything harder than the 12mm wrench.

Any help would be appreciated, I just can't see where I can even fit the tools in there to get the bolts out. Oh yeah, I have an 08 3500 w/ the LMM.

Heating up the nuts and putting on some penetrating oil is a must!

Are you working through the wheel well with wheel and plastic wheelwell liner removed?
Here's info from the DIY>
http://www.dieselplace.com/forum/showthread.php?t=107575&highlight=manifold

Thanks for the input. I finally got them. I just needed more leverage in the form of the handle from the floor jack.

Moved to Fuel System, Air, Exhaust, & Emissions Upgrades...