I see them for around $45 bucks each on Amazon. There are a couple of negative reviews from G37 owners. Any 370Z owners with negative experiences?:confused:

i didnt like them.the oem pillows seemed to have more flow on my 09.i finally did a shop vac test where you stick the pipe from a real shop vac to one side of the filter and see how far away you can get, or how closer rather,before it will pick up a piece of card board.oem filters won.car just seemed to run better with the oem filters.thats my experience.i believe the k&n filters block more flow resulting in a slower flow to the maf and therefore making more power.imo of course.

I've had them for almost 2 years now, no problems as long as you maintain them properly. You're going to find something negative about every product if you look hard enough. The problem with these is that people don't re-oil them properly or damage the filter somehow.

That's not very scientific, and if there is less flow with the K&N, there would be less power. It's proven on the Dyno, not a makeshift shop vac test, which you're not suppose to do by the way since it could damage the filter element.

less flow over the maf results in more power via less fuel being dumped resulting in a more lean condition is it not ?

Less fuel & less air equals less power. Lean/rich conditions vary depending on the tune parameters and is adjusted via the MAF readings. If there's less air flow, then there's less power...more airflow, more power. The A/F ratio is not something static in electronic fuel injector engines since it can vary the amount of fuel. This is basically why people eventually need a tune. It gets pushed beyond the stock map when they add bolt ons that increase intake and exhaust flow.

With a turbo for example, you're pushing more air and in and the ECU will tell the injectors to dump more fuel.

then might as well trash all of the aftermarket intakes lol.especially the ones with bigger pipe tubing slowing down the air flow.

edit;regardless,im not here to argue.you're happy with your setup and im happy with mine.:)

Apparently you've never heard of a turbo or supercharger then, lol. They're basically forcing MORE air into the engine.

Weren't you the guy that hacked the hell out of the stock intake box for your own "cold air intake" lol. Where are your dyno results btw?

not interested in dyno's lmao.im interested in how fast the car gets to its top end :ugh2:

Then by all means, continue on your delusions.:tup:

thanks ! i will :tiphat:

Actually, Apexi makes the best filter. Here is a comparison:

Car Filter Review

Only had my K&N's in for about a week, no problems so far. I don't know if it's just in my head or if I actually got gains, but it feels like I have slightly better throttle response and power. I think the engine sound/exhaust sound is a bit louder too (which I like). The stock filters were fairly dirty anyways, so I'm sure the engine is breathing better in any event.

Guys I just got these last week. I did notice a slight bit of throttle response. I bought them from StreetSideAuto.com for $39.57 a piece. With shipping they were $89.09. If you don't already have these, buy them.:tup:

I haven't noticed anything with my drop-in's :ugh2:

I got my set for ~$75.00 from AAP. They had a nice promo code going on at the time

I know this is quite an old thread, but I came across this video and it kinda puts any "do they do anything" debate to rest:

https://www.youtube.com/watch?v=uf2Do9dQzn4