Depends how effective your nose spoiler is...if the spoiler allows a lot of air under the nose you may see benefit from the louvers. If you have one of the large air dams spoilers I'm pretty sure they are pretty effective at keeping air from going under the nose. Dennis Antenucci told me his air dam was pretty effective. Note the picture with no louvers. If it had made a big difference I'm sure he would have done it to improve his ORR times and speed.
Interesting story behind nose louvers...Bruce McLaren was the first to do the louvers on the fenders and it was discovered purely by accident. Bruce was testing one of his Can Am cars and accidentally left the pit with a nose access panel to the brake master cylinders partially un-fastened...he was on the straight away picking up speed and noticed the panel started to lift because of the air pressure under the nose. The thought in those days was the wind coming across the nose was pushing down on the nose...so they thought. He drove back into the pits and had the panel totally removed and made the hole bigger and found that the nose didn't lift as much. McLaren continued to modify the design and ended up with the louvers on the fenders. This cured some handling problems at speed for the McLarens.
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