for stock get SRT /ecu otherwise ... injen probably best for it's price range and if price dont matter look at the other intakes they made for is300 or even a TRD or BLITZ air filter will increase around 5 or more hp .. not too sure.... so maybe a combination of PLP silent intake which claims 8rwhp and about 8lbs torque..... and the filter because plp keeps the same air filter box. OR DO THE EXTREME and DRILL A HOLE AND MAKE YOUR INTAKE A CAI!!!! haha jp ... there's some pictures of a guy who did that in the forums somewhere. but he said he never got to test it out ..
aem is koo but it seems to be the worst out of all the popular intakes for is300 but dont get me wrong . they can be good too. they dont have a heat shield or anything but pretty sure you can make one at home depot lol . dunno bout gains and stuff... HEY MAYBE aem will come out with V2 for the is300! lol wait til then if you AEM fan. lol as for the SRT its for STOCK parts mostly but i think lot of people have the XERD pipings with the SRT but i know SRT doesnt work with the TOYOMOTO pipings. just go with injen . best for its price. oh yeh i remmeber there was an offer on EBAY ... brand new AEM for is300 for 125$ shipped but that was while back. they like 200ish shipped now.
AEM= 50 percent work great, 50 percent can either throw CEL, or stall.
INJEN= first few gens didnt work out soo well.. i think gen 3/gen 4 got better and works better too..first gen and second gen lost hp i think, or gained like 1hp
SRT- everyone has it so join the band wagon.. everyone says its great and yea, its pretty nice.. but 600
PLP-SFI/ JOE Z- smooth pipe concept , retains stock look and stock air intake scoop/box, your choice of filter ( i would suggest TRD filter-8rwhp)
This intake is nice, i had it for a while, good choice, not too much louder than stock, and the gains were good... a good intake for 115degree weather..lol (vegas).
K&N tyhpoon- pretty nice looking intake, blue, red, etc. Made by K&N for that "show" look. Growls REALLY loud and sounds awesome. Good power, i liked it a lot. No carb cert tho, (maybe now it has one, but it didnt at first)
K&N FIPK intake- wow. i really like this intake. responds well and great power/sound. carb cert too. thats always a plus. plus, it was a gift from my awesome gf, so that has added hp too hehe..
outta all of them i prefer PLP or the K&N Fipk. the typhoon, if carb certed would be another good choice.. im just not too hot on srt and aem.
btw, as far as edgys CAI,.. great job ed! congrats.. cant wait to see the dyno on that baby.
screw the intake get a turbo . lol your intake wont make your car go too fast. maybe able to keep up with a fixed up civic si. lol but yeh ... if you planning to go all N/A intake is a must i guess unless you consider supercharger N/A.. always thought it was but my friends bitched at me that superchargers aren't N/A....