Depends on what you like for looks. I like the FIPK 2 over the 77 series but i am not a big chrome or pollished guy on anything other then rims.

I like min and it looks good as well. use some interior cleaner (like sunof a gun) on it and it will shine a nice glossed looking black.

 

if you look at the dyno sheets they chevy from the 77 series started baselined at a higher HP rating than the GMC from the 57 series, they both ended up at 257.33 (257.43 for the GMC). seems kinda odd, could easily be air conditions