4 into 1 vs twins (cannons)muffler vs stinger

can someone pls explain to me why a 4 into 1 system is better than twins or cannons on a vw motor??? what is merged and what is semi merged.
educated responses pls no my mates best friends aunty runs a .....
what motor do you run what have YOU tried on it/them(sizes brands lengths etc)and what have YOU noticed ?
also mufflers vs stingers
what would you run on your motor if there were no legal restrictions

this is fully merged

http://www.cbperformance.com/catalog.asp?ProductID=1634

this is semi merged

http://www.cbperformance.com/catalog.asp?ProductID=387

the collector in the fully merged is longer and "extracts" the gasses better

the reason the cannons are no as good is you only have 2 gasses extracting - not 4 working together

VERY simple explanation

Additionally - if you look at the merged the firing order at the collector is 1-2-3-4

Giving a good twist as it goes out

Most if you look at them are 1-4-2-3
Not as good for extraction

As the gasses enter the collector, they leave a area of low pressure behind each pulse. Bu having all four pulses going into the collector they cause suction for the next pulse and there almost suck the next pulse of gas out. This therefore lower resistance......

as stated above a 4 into 1 allows each pulse ot pull the next, while cannons only work on one side....

Personally a semi merged is good (i also got the weld all fixed up and port out the collector) and a nice fully merged is the best..

Bizarre wrote:this is fully merged

http://www.cbperformance.com/catalog.asp?ProductID=1634

this is semi merged

http://www.cbperformance.com/catalog.asp?ProductID=387

the collector in the fully merged is longer and "extracts" the gasses better

the reason the cannons are no as good is you only have 2 gasses extracting - not 4 working together

VERY simple explanation

personally i like the "torque pipes" at the bottom of the page each cyl with its own exhaust

http://www.ssheaders.com/header.htm

http://www.burnsstainless.com/TechArticles/Theory/theory.html

There's good info at the above links. It really is difficult to go into great detail about exhaust theory but those links provide an insight.
Personally I've used stock, semi merged and merged. Merged is the best choice for power but semi merged generally gives a wider spread of power.
If there were no legal restrictions I'd run a high flow muffler because a stinger is way to loud on the street, believe me I've tried it, I lasted about a week. I got sick of it before the cops got me.