Premise:  I installed a triton 5.4 V8 in my Crown Victoria.  The stock exhaust fit, but who wants to leave well enough alone....

I had an exhaust shop run 2.5" pipe from the manifolds back to the stock muffler location, then welded on a pair of flowmaster 50 series mufflers.  I skipped the tailpipe and just dumped them at the rear axle.

MY QUESTION:

I'm going to add an "H" to the design.  I can do it one of two ways. 

One, I can put it fairly close to the motor, but the crossover itself will be comparitively long. 

Or two, I can put it slightly further downstream, in which case the crossover would only need to be a few inches long because the two pipes are closer together.

Which is better and why?

What I've read is that you paint the exhaust pipes and drive  until a spot burns off. That is where the h-pipe shold go.

 thanks for the input.   Is there a "because" to go along with that advice?

http://www.hedman.com/FAQ/?id=7176