First Mods
NPP fuse pull- I see no reason to replace the Dual-Mode Exhaust and it gets better if you do the fuse pull. When the weather is warm enough, I usually use the A/C in my other vehicles, but not so in my Camaro, windows down to fully enjoy the sweet sound. Here is a link on how to do the fuse pull:
http://www.camaro5.com/forums/showthread.php?t=268970
Hood Vent Baffle removal- The owner's manual does state that for the Z/28 the baffle can be removed for more underhood airflow. I see no reason why this would not benefit the other models with this vent. As far a water/rain causing issues, I normally do not drive this car in the rain, and as long as you do not blast any water in the vent, there will be no problems. GM's WeatherPak electrical connectors are damn near bulletproof.
Removal is easy. Just remove the two piece push-pins, remove the baffle. You can reinstall 2 of those push-pins back into the hood liner to hold it tight to the hood. I got 7 of a different type of push pin at my local hardware store along with 7 rubber washers (as spacers) and installed them in the remaining holes in the hood, just because I thought it would look better.
Apex Motorsports Catch Can- I liked the Apex catch can and how it mounts. The only thing I did differently was add a 45* hose fitting at the top of the catch can were Apex supplies a straight. These fittings are RedHorse Performance Fittings. In keeping with an OEM look, I went with the black rubber hose. This catch can and mount are very high quality. Apex part # APX9001