I have the same one and it's been around longer than the spectre. I mean it's a 4 1/4 inch pipe married to a 4 1/4 inch TB what's not to love? Throw a 6in k&n on that velocity stack and go with it. Other CAI manufacturers have feel short on the silverado in my mind. 3 inch pipe to a 4 inch tb come on....
If I knew a CAI would add that much more pull at the top of the gears I would have done it a long time ago.
2001 Silverado, work in progress. Add a vette servo and Nissan e-fans