Nice man... My buddy was thinking about getting these for his 03 Z. How much is that supposed to do?
If your buddy is making a 100% track car that must meet some weird specs to race in the class, then tell him to go for it.
Maybe even if hes building a show car that must remain N/A and hes after pure bling
If for any other reason..... why? 350Zs are like Honda civics in the sense that it has so many friggin mods the skys the limit.
There's 5143980 mods that would give him more bang for the buck with no where near the hassle.
Resale that Z with those, = fial
Smog testing with those = fial
any inspection with those = fial
Gaining any real power = fial
Only win I could see is the sound, then again a simple popcharger (129.99) might sound better.
For airjockys case, they're pretty neat, and make A LOT more sense to do.