[turbohips]

Hi all,
Just wondering what the difference is between the "X" pipe deal and a true dual exhaust? All info is welcome.
Why do the pipes cross on our cars and with the Borla? More power?

 

[smilin assassin]

true duals are set up to allow the engine to breathe from the headers directly into the pipes and out...they are loud and you will gain more horses than a traditional cat-back exhaust..

before i bought my 300C i had a 02 Z28 and guys with true duals would have to "dump" the pipe before the back axle usually b/c it is a pain and expensive to extend the pipes to the back of the car...plus there were things deal with like fumes, ground clearance, etc to deal with..the cars with them sounded mean as hell

two different cars but i would like to know if others have done this yet on our cars..i don't really see that being the case on a performance sedan though

 

[vvv90]

The theory is that as individual exhaust pulses move down the exhaust tract, they leave behind them a negative pressure wake. If the exhaust pathways come together at just the right places, (I.e. cross-pipe, instead of just true duals.) then these negative pressure wakes can help "suck" on neighboring cylinders in such a way that those cylinders achieve much higher filling then they would on their own. Some engineers state that the suction on the intake tract due to proper exhaust tuning can be as much as 500% greater than the suction caused by the piston moving down in the bore. This shows the importance of proper exhaust pressure wave tuning done with crossover pipes vs. straight duals. It is possible to cause a cylinder to draw in a greater amount of air/fuel than would be indicated by it's volume alone.

For an understanding of why this is you'll need to understand how "scavaging" works.

 

[JP300c]

so if we change to straight pipes instead of the xpipe...is it detrimental to our engines and performance?

 

[Mr.DJ]

The theory is that as individual exhaust pulses move down the exhaust tract, they leave behind them a negative pressure wake. If the exhaust pathways come together at just the right places, (I.e. cross-pipe, instead of just true duals.) then these negative pressure wakes can help "suck" on neighboring cylinders in such a way that those cylinders achieve much higher filling then they would on their own. Some engineers state that the suction on the intake tract due to proper exhaust tuning can be as much as 500% greater than the suction caused by the piston moving down in the bore. This shows the importance of proper exhaust pressure wave tuning done with crossover pipes vs. straight duals. It is possible to cause a cylinder to draw in a greater amount of air/fuel than would be indicated by it's volume alone.

For an understanding of why this is you'll need to understand how "scavenging" works.

Wow...I couldn't have said it better myself. It should be noted that my 'Zoomers' custom dual exhaust system actually came with a Magnaflow 'X' pipe which replaced the OEM 'H' pipe. :fing02: