Most popular I would say is the JWT popcharger...do a search the other options are out there. A lot of people also went for the K&N CAI intake or the NISMO CAI. Stay away from the AEM however, a lot of people have complained that it is not very good, and it can even lead to a loss in HP and TQ.
But something to keep in mind is that even though the Nismo is overpriced and probably loses power, some dealerships will still honor the full warranty (at least mine did). If you're looking to save money, or get more power gains, the popcharger seems to be the way to go. For the peace of mind, I went with the Nismo.
There is no real best intake out there. Every one makes such minimal power gains that it can almost be +- error on each dyno that has be given on each one. There is a comparison out there and from what I remember JWT and Injen showed to be some of the better although neither make any signifigant gains
Rumor has it that Crawford has said that (with their new plenum) the popcharger yeilded more ponies.
If you're doing extremely extensive mods to the intake of your Z (upper and lower plenum, ect...), then I would talk to the manufacturer of whatever parts you will be buying in the future (Kinetix, APS, Crawford). They will point you in the right direction.
I think Dave said it best though...you're not going to see more than 4-6 horsepower total. Injen and JWT are said to be the best though.
I haven't seen the SPL pip, but it's probably not any better than stock, and I've heard that the Varis duct doesn't get air there any better than without it. Plus, I think it looks kinda goofy on a lot of cars (looks good on some).
The best intake is the stock intake with a replacement filter like K&N or ITG. Unless of course you are going for cosmetic or audible enjoyment. It's a proven fact (wether you believe it or not, unless ECU is reconfigured) that you will lose power with aftermarket air intake. Air intakes are amongst the biggest gimmicks in the aftermarket industry today in regards to performance gains, they're a guaranteed performance loss, not too mention voided warranty and possibility of sucking up water (valve or no valve) and destroying the engine. So unless it's cosmetic or audible grace you seek, keep it stock and purchase a replacement filter.
Actually ChazzG has done a huge write up on these with Dynos and technically they dont make your car lose hp except maybe for a couple of them. I believe AEM may have been one of them. Can anyone find this. I cant seem to find it even in a search.
A forum community dedicated to Nissan 350Z / 370Z and Infiniti G35 / G37 owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, exhaust, turbos, maintenance, and more!