STILLEN 403235 Z-Tube Without Intake - 03-07 G35 Coupe / 03-06 G35 Sedan / 03-08 FX35

The Stillen Z Tube arrived earlier than promised and they even threw a license plate frame in the box. product was packed well and came with instructions (incase you need them, its a very simple install). took about 15 minutes to install and I was not in a hurry, it can be done faster. Performance wise, There wasn't a huge difference. I did notice a little more available power once I hit 3,500 RPM or so when doing some test runs, it was almost like the car got it's "second wind". The intake and exhaust have a little bit more of a "throaty" sound which is cool, not obnoxious, just right. I left the stock intake box and added a K&N filter. I also removed the baffle from the bottom of the air cleaner box. sounds great.On the negative side: It doesn't seem like Stillen takes a lot of time to refine this product. there is excess plastic ridges along the seam where the tube appears to be put together from 2 halves (or where the 2 halves of the mold come together). Also the seams are uneven, one side was higher than the other. there is also a ridge on the PCV hose mount. I was honestly skeptical that I would get a good seal on the hose mount or the ends of the tube, but it does seem to be working, I haven't been able to find any air leaks. The inside of the tube is smooth but there was tiny pieces of plastic residue all up in there so make sure you wipe it out before installing.On a final note, I got in a rush at the end and forgot to reinstall the Mass Air Flow sensor wires before starting up the car. It was idling like crap and the check engine light came on. after about 30 seconds I realized what I had done and plugged the MAF sensor back in. idle cleaned up some but it was still high and rough and still had the light. I ended up clearing the fault with a code reader and it went right back to normal, no issues since.Over all I'd say this is a good product for a reasonable price. I just wish they would smooth out the exterior and clean it up some before shipping to a customer.*Just a quick update, I’ve had the Z Tube I staled for almost 5 months now and there have been no issues what so ever. Car still has that subtle throaty growl and runs like a champ. Definitely recommend this product but I’d also recommend sanding or using a hobby knife to knock down some of those uneaven edges and ridges before installing ( if yours shows up like mine did anyway).

For the price it was worth the buy. It would’ve been nice if Stillen had made the tube where it had the collapsible tubing where the air box or the throttle body is located like the 350z factory z-tube; along with a support bracket that attaches to the top of the engine like the oem it’s replacing. All in all for what it does I guess it’s ok. Haven’t noticed anything different in horsepower.

Much better than the original air duct, however when I was replacing the original component the upper coupling to the throttle assembly was torn, that particular coupling is not available in stores. I had to fix that right then and there, black duct tape solved it. I would recommend having after market ducts on hand to replace the OEM couplings while making the switch to the Z tube.As for the performance of the Z Tube, well worth the money, tighter acceleration and throatier sound. Don't think it adds more HP but I like it, I'm going to pair it with the JW Pop Charger air intake.

Installed this on my 04 G35 Sedan with factory airbox. It is just ok. Fitment length is good but orientation is wrong. If tube is aligned in OEM orientation, the breather nozzle is 180 degrees out and too far back. When the tube is rotated around 90 degrees for the breather nozzle to reach, it barely reaches the hose and the tube faces downward. When the tube faces downward it has to flex the couplers a bit to fit.Compared to stock tube, sound improvement is barely noticeable. Throttle response has no change.I’m an engineer and long time hobby mechanic.

Bought it in june 2015, easy to install, shipping was fast for me,. It does make a difference in sound, thats it. Doesnt add horse power, doesnt make your car go faster. It just helps your car breeath better thats it. Whoever says "YOU CAN REALLY FEEL THE DIFFERENCE" is basically living in a dream. . Unless a car is making 10% more power, you will never feel a diference at all.

Quality durable piece! The placement for the brake booster tube is a bit far back so either stretch it out to fit or buy an attachment to reach. Sound is a little louder not overbearing at all, but I'm using a K&N filter not a pop charger. Performance is near the same vs an aftermarket intake tube so save the money unless u want louder, injen and takeda make low price quality intakes if ur chasing noise😎

BEST bang for your buck, my response way faster, I put it on my infinti g35 with K&n filter and it sounds like a beast when I hit about 4 rpm, I have everything else stock, so it really good I think it really give you a couple horse power, especially if it made of plastic it doesn't make so much heat as a metal tube would, easy install just look up some videos and you should be good to go,

The factory pipe on a G35 is super restrictive and small in diameter compared to the Z tube. Installation wasn't hard and pretty straight forward. Now in terms of performance, best bang for the buck bolt-on mod when coupled with the JWT pop charger. There's an aggressive growl you can hear and feel anytime you get on it. I'm 100% sure you'll love this thing as much as I do.