As long as there are two continuous paths for the exhaust to take from the engine to the exhaust exit it's considered true duals, doesn't matter if there's an H or X in there. If it merges into one pipe at any point, it's not true duals anymore.
yeah , thats true i know with an h or x it would be true duals, but i wanna know if the h will bolt up to the headers where the factory y pipe does directly
mac has a great h-pipe for you v6 it is part# c3384 $399.50 for the catalytic pipe and part# 34038 $169.50 for the off road h-pipe. the mac cat back system that will bolt you correctly to these h-pipes is part#TK2960 for $299.50. this is a great sounding and looking system for your car and will bolt up to your factory headers. the only other things you will need is a passenger side muffler hanger bracket and tailpipe hanger from a 97 4.6L v8 mustang. i hope this helps