Short runners vs long runners IM

[aronmatic2]

I am looking for the answer for my old question.
Wich Im is better and why. I am using long runners IM.
I am planning to change to short runners. Nobody can give
me any answer for the difference, i have to try.
I see one thing, the big tuners using short IM.

[caterpillar]

LONG runners= more Nmoment,and lower power
short runners=less Nmoment,and high power,and high rpm.
to combin theese are som art i think

[grundey]

Any calculations???

[caterpillar]

its commen known,but i cant give you any calculations,sorry i dont know that. if you use some cone runners,you may have some halvlong ones,i think,some have really the prob with the space in the enginecompartment. i will use like this : http://www.g-e-t.biz/ the 56-46mm ones,they are pretty long,so i will shorten the peace some.

[aronmatic2]

i have 335mm long runners. the torque is not too agressive.
boost comes around 3500rpm. i have 2.0bar at 5000rpm
and lose strenght at 6500rpm. i am thinking about the runners or change my
IC. my 1/4mile is not too bad 12.2, but i dont feel my car strong on higher rpm.

[Audi_CQ]

i have 335mm long runners. the torque is not too agressive.
boost comes around 3500rpm. i have 2.0bar at 5000rpm
and lose strenght at 6500rpm. i am thinking about the runners or change my
IC. my 1/4mile is not too bad 12.2, but i dont feel my car strong on higher rpm.

Do you know how much NM at 5000?