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V6 Dakotas come with "dual exhaust manifolds". If your asking about exhaust systems, all I've seen are singles in and out or single in with dual tips (mufflers). The pipes to the mufflers is Y-pipe to single.
It can be a I4 or a V6. If it has dual exhaust it is a V6. If it has a single exhaust pipe out the back it is a 4 cylinder.
Maybe 10
true dual exhaust would mean that each pipe would be atached to an exhaust manifold of its own. It might be a v6 or v8 or as in the old days an inline 6 whith a split manifold was popular.
An X pipe is a modification for a dual exhaust. As far as I know all the V6 Mustangs have a single exhaust... So no.
If it has dual exhaust pipes it is a V6. If it has a single exhaust pipe it is a 4 cylinder.
2 1/4 at tailpipe
The single exhaust V8 for 1987 had about 150 hp. The 1988 with dual exhaust was 160 hp. V6 ?
In some case it is just for looks as they are not true dual exhaust systems. In other cases they are for improved performance and are true dual exhaust systems. On most V6 or V8 cars they do improve performance. On a 4 cylinder they do very little to improve performance.
Two if you have a V6 with single exhaust. One before the cat. converters and one after. A total of 4 if you have the V8 with dual exhaust
Really it hardly allows more exhaust throught since it is a dual muffler not a true dual exhaust system. You could block one of the exhaust pippes and your car would still run fine. Most of it was for sellin props like mentioned in the previous answer. to allow more exhaust gas to flow out than a 4 cylinder. and for selling purpose
there are 3 dual post coil packs underneath the front exhaust manifold.