Originally Posted by Veyron
It depends on what kind of dual exhaust it is...
What makes an exhaust a performance exhaust is the ability to increase the amount of exhaust gases the engine can put out to allow better breathing.
Which is why mostly you will see an exhaust with a huge muffler tip...and made out of stainless steel.
The piping is also bent in certain ways to allow for optimal free flowing of exhaust gases exiting the engine...effectively reducing back pressure.
True dual exhaust for V-8s...I'm not sure about v-6's...but for v-8s they typically take advantage of having two separate exhaust system coming off the engine...too reduce back pressure..
Fake dual exhaust systems are not nearly as effective and are for more aesthetic purposes..
As I usually digress:
Another thing that has worked well, in addition to true dual-exhaust is an H-pipe between each of them right behind the motor..... The Fords I had used to have them... makes working on the transmission a real PITA. It has been a while since I did this stuff... we didn't have X crossover pipes back then, unless you fabricated your own. Also, nothing like 2.5" stainless pipe, though we had to pack them with sand before putting them on the mandrel bender, so they wouldn't split.
To further digress, the first blower motor I built and put on a Superflow, I was sort of weirded out when I saw the mufflers swell so much under WOT.
I thought they were going to burst, but the technicians said "don't worry about it'.
Back to our regularly scheduled thread.