There are dyno's on the site of the stock box/HPS tubes/K&N drop-ins. The power gains between the stock boxes (13hpish) and the G3 (16hpish) is about 2-3 HP in favor of the G3. The ones I saw were on a Z with HFC's and aftermarket exhaust if I recall. The G3 seems to yield more high end (less used) power while the HPS/K&N drop-in yields more mid-range power (everyday driving power). For a 2-3hp difference its hard to justify spending the extra money unless you want some bling in you engine compartment or want to go for max HP regardless of where it is. The G3 has more documented testing to date because thats what everyone's been using until recently. It seems more people are starting to use the HPS/K&N option and I think you'll likely see more testing as its popularity increases. Right now HPS tubes are back ordered everywhere so its fair to say that they are gaining popularity.

The evidence is in the puddin. Take off those intakes and see, your Z is quicker and much more powerful without out them. not trying to say your wrong about your g3s but u asked for proof.

Take them off and see with what, my butt dyno? My butt dyno's been known to be wrong 9/10 times, just like everyone else's :) In any case, it should be obvious I once had stock intakes, so I did get a street driving comparison in at the time of install.

If you're going to make the argument that while the G3s look better on a dyno, stock intakes with K&N drop-ins perform better on the street, you're going to have to come up with a better testing regimen. Maybe a pair of drag strip runs, but even then weather changes while the car cools down between runs might make as much difference as intakes do.

I wouldn't expect such a slim margin, but I'll admit I could be wrong here. Keep in mind with numbers this small, you really can't compare different dyno runs done at different locations on different cars, etc. I'd love to see someone take a couple consistent dyno runs on the G3 vs HPS+K&N all in one sitting, that data might be worth something.

You're saying the G3 loses mid-range vs the HPS+K&N? Again, it's possible, but I find that hard to believe without some rigorous comparative results.

Of course they're popular, they're cheap and easy and obviously better than stock. Pulling the bumper and cutting holes in the radiator core support doesn't really appeal to most people :). I'd still like to see a better comparative analysis before anyone starts thinking it's a foregone conclusion that they're a better deal.

(btw, my Z is probably the single ugliest one on these forums, it's the anti-bling Z, even under the hood, so don't throw that at me).

Also Might I add that since I removed my aftermarket intakes, I can now enjoy the sounds of my hfc and aftermarket exhaust. The noise level under the hood with aftermarket intakes should be enough to toss them. I would rather have a nice clean exhaust sound , Rather them trying to hear the exhaust over the engine.

You are an odd cat.

What intakes were you running that seemed so loud? I think my g3 intake is actually pretty quiet. Maybe a short ram is actually the loudest? It does seem like there may be a lack of air pressure in high speeds with the g3 intake. Well, hope not. lol...

I am sorry, but what is HPS? Sorry, noob here.

sounds like your intakes werent installed correctly cus they arent that loud. Which would also explain why you think that going back to stock air box = more power.

I donno, the G3's do add a lot of noise at high rpm. Mostly I only notice when I'm outside the car (e.g. on the Dyno) though, the exhaust definitely overpowers it when I'm in the driver's seat.

Ive never heard such madness.....:shakes head:

Just like to stir it :-)