Exhaust question

[Mustangc1923]

i have a borla exhaust system on my x i love it ... i was wondering if there is a possibilty if i bought another system coudl a dd the muffles and make a dual out? reason i ask is i wasnt louder and also i saw a corvette the other day who had like on pipe running back then it had two mufflers which each split into two pipes... im just curious if this would work .. and im sure id have to remove the spare which isnt a problem...

Chris

 

[Odman]

It is possible, if your going after looks, just branch off on the farthest point on your current system. If your going after performance, run duels all the way back from the exhaust manifolds. That will only be useful if you opened the flow of your intake. I would just branch off and run the pipe out the opposite side.

 

[leenjen]

but a true dual exhaust on a OHV 4.0 is useless. you'll loose a lot of low end torque (and that's all this engine has, the horsepower sucks).

 

[Mustangc1923]

there any way to try and counteract with the loss of the torqe leenjen?

 

[Robb]

if you open the resistance of the exhaust, the engine inherintly looses torque. the only way to regain it is add resistance to the exhaust. it's a catch 22

Robb

 

[Mustangc1923]

wow now im lost

 

[Robb]

In roblish:
The engine came from Ford with a certain amount of backpressure (created by the exhaust system) on it. The less resistance, the more free the engine can turn (allowing more HP). WIth more resistance, the engine has to work a little harder (producing more torque). Ford decided on a good compromise between the two.

Now, when you put on a more free flowing exhaust, you changed that compromise and created a little more HP at the cost of losing some torque. By freeing up even more resistance (backpressure), you may gain even more HP, but at the cost of even more torque. Enough to the point where you may notice your X not getting up and going like it used to.

This is extremely simplified. There is a lot of science behind finding the "perfect" compromise to satisfy your needs. SOmetimes it is a matter of trial and error.

Robb