ok question i need the dimensions of the tube that goes from an aftermarket air filter such as a K&N to the throtle body. Any help? im making a carbon fiber one

 

Is this a trick question?

It depends on the air filter. They are usually 3", but can vary. Once you have the air filter, you measure the diameter, and then you will know.

 

if you would really like answers that would help you and avoid flames give the following info when you post: year of car, n/a or turbo engine, stick or slushbox. Most of us can tell by the year what model you have ie 85T is a turbo z31. Z cars come in many flavors and they are all different. example 84,85,86 Z31's pretty comparable. there were changes in 87,88,89. in addition 300ZX can refer to two completly different cars the Z31 and the Z32. No mindreaders here the more info you can post the more likely you get a cogent useful answer

 

If i can remember, i think the outer diameter to attach a filter or even tubes from the filter to AFM is 2.75inches. I did the 240sx Throttle body swap, so the openings are the same throughout the whole thing onto the intake manifold. Rather than Big tubing to very small on the stock Throttle bodies. My info is based on the 280zx (s130s) Hope i helped.