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for a V set up cylinder ie v6's v8's twin exhausts are a lot more important as you run the 3 or 4 cylinders separate all the way from the manifold which in turn increases flow because u dont have to join the cylinder banks, but on a straight 6 like the skyline they can make a slight difference in power but it is genrally more of a noise/looks choice hence why 90% of high end aftermarket skyline exhausts are single.

you cant exactly say its better just because there aren't spec's of the exhaust, it also depends on the system: mandrel bent system is a must for a N/A power wise....but thats the system and there are rules and many components there.

judging by what you ask performance

stock r33 gtst exhaust would be good performance wise, noise not so eye catching, but a varex from x-force is the mix between performance and noise and as long as you dont use a cannon you will be ok

just stick to keeping the pipe work 2.5" diameter and the outlet not to big

A twin exhaust?

Im going to go out on a limb here and say the tip of the muffler?

Because twin or single its going to make absolutely no diffrence. Its far too late in the exhaust system for it to have any effect of noise or "performance" or anything of the sorts.

Purely show

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