Cross overs in exhaust - Pontiac GTO Forum
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post #1 of 5 (permalink) Old 11-09-2004, 01:01 PM Thread Starter
 
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Cross overs in exhaust

I have been looking at aftermarket exhausts for my car and I notice almost every package comes with some sort of cross over pipe.

Is there something fundamentally better about taking away the "true-duals" from the existing system? I would think that that a true dual system has lower back pressure than a combine system.

What am I missing?
hm3to1stlt is offline  
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post #2 of 5 (permalink) Old 11-09-2004, 02:35 PM
 
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Having an H pipe or X pipe in an exhaust increases scavenging from side to side, i.e. a pulse going down one side creates a small vacuum that helps "pull" the next pulse from the other side. Also equalizes backpressure from side to side.
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post #3 of 5 (permalink) Old 11-09-2004, 05:57 PM
 
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Quote:
Originally Posted by hm3to1stlt
I have been looking at aftermarket exhausts for my car and I notice almost every package comes with some sort of cross over pipe.

Is there something fundamentally better about taking away the "true-duals" from the existing system? I would think that that a true dual system has lower back pressure than a combine system.

What am I missing?
A siamese pipe will aid in flow. True duals can actually worsen performance. GTODan is right (not many people know this fact).
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post #4 of 5 (permalink) Old 11-10-2004, 09:50 AM
 
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Not true, ask any of my friends, I am always right
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post #5 of 5 (permalink) Old 11-11-2004, 06:55 PM
 
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Dual exhaust with a cross over pipe is better for performance.
One other misconception about performance exhaust is the
pipe diameter. These big 3 inch pie systems are overkill for a small
block. Loud noise doesn't always mean better performance.
If you want to see some seat of the pants performance from an exhaust
upgrade headers will make a mucher bigger difference than a cat back
system. I read in one of the posts that if you run your car with the
factory cat back system off , you only gain 4 rw hp. I dont think that
buying an $800 exhaust system to gain a portion of that 4hp isn't worth
it.
There is another forum on LS7gto.com and some people were complaining
about how loud the kits they bought made their cars.
Monte is offline  
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