Originally Posted by Maxout05

There difference between metal intake tubes performance and plastic tubes is simple and a well known factor and as stated above the plastic proves better.
Heres why:
The plastic resists heat in the engine bay which in return keeps the air going into the intake cooler.
The metal gets hotter which in return makes air going into the intake hotter and then the cold air intake is more of a warm to hot air intake. The race performance shop near me that builds track cars have significant proven dynos behind this thought as well. Plus its pretty much easy for anyone to figure out.

Originally Posted by 4.6 Punisher

Apparently you don't have a dyno to prove your allegations that materials do not affect performance even though the company that makes the product says it does.