Does anybody make a set of C6 headers, preferably stainless, that bolt up to the stock exaust system?

I am swapping an LS1 into a Jaguar, and the C6 cast iron manifolds almost fit. If I can rotate the flanges 90 degrees, they will be perfect. I think this heavy cast iron manifold will be tough to weld without cracking or warping and I figured that if I got a set of tubular mild or stainless headers, it would be much easier to cut off the flange, rotate it 90 degrees, and weld it back on.

 

I am not aware of a set of C6 headers that can be installed to the factory H or X pipe. Most Long tubes also require the aftermarket X-pipe that can then bolt up the the catback. Hope that helps