Originally Posted by UNKNOWN_370

Power wise, the stillen is the marginal best of all the intakes. I just bought a G37 in november and just had an intake installed a couple weeks ago. I chose INJEN for a few reasons.
A) @ $430, it was $120 cheaper than stillen.
B) stillen promises 18 crank hp, injen will add about 11rwhp. (Rwhp is my main concern, not crank)
C) no pulling off the bumper or drilling to install or other tedious problems like the intakes not sealing properly due to improper cutting and stuff. The INJEN sounds more muscular and is a better all round value though you may lose 2 or 3 HP at the crank. I bet @ the wheels its probably only a 1 hp loss from stillen.

Hope this helped?

P.S. have the dealer install it. Then if its done improperly. It falls on them. You have a 30day workmanship warranty. On top of that they will be forced to swallow any issues with install.

P.P.S. Why did AEM abandon the Z/G? I loved there products in my. 98 240sx and 06 G35 sport. I see nothing from them since 06.