another velocity stack question.

[Diskovod]

Actually, comparing the length of the velocity stacks isn't quite accurate. The engine reflects on the WHOLE intake lengts - stack+ITBs+connector+intake port length... so that's it...

For 16V 4A-GE.
And if you want to gain something with (for example) stock cams with intake closing at 51 degrees at BDC, then the lengths would be:
for 5000 6000 7000 8000
cm 28,4 23,7 20,5 17,7
in 11,15 9,33 8,05 6,93

For 20V 4A-GE.
For stock cams with VVT engaged (closing intake valve @ 40 degs):
for 4000 5000 6000
cm 27,7 22,3 18,6
in 10,90 8,75 7,32

VVT turns off at 6500 so after this the intake valve closes @ 70 degs as usual:
for 7000 8000 9000
cm 28,1 24,2 21,7
in 11,04 9,52 8,54

As for all the minimum intake pipe (outside the head) for 20V equipped with VVT-i should be at least 11.9 cm (or 4.68 in).

happy tuning