what would be a better hp gain, and a better cold air intake in general. The roush Cold Air intake or the K&N cold air intake?

 

I like my K&N. Its legal everywhere, and has great HP gains and excellent reliability.

 

Are you dead set on one of those ones? If not then I suggest the S&B CAI. One of the best out there for power gains and affordability, plus it's legal everywhere just like a K&N kit. It also looks a lot better in my opinion.

Click to make them bigger:

 

The S&B and AF1 are both NOT legal for California.

They are definitely both good intakes though.

 

S&B isn't yet. Taken from their website:



Or if he doesn't live in Cali then it won't matter anyways.