u serious. i havent see anyting published that the HKS is dyno proven motre than the stillen? maybe im reading old imformation/ thanks for the imput

Intense motorsports had a dyno at 12hp/9tq. And I have seen other dynos in the same range.

what about the greddy evo2 ?

Greddy is a nice system too. Sounds great, good power but I could never get over the big canister looking things.

injen - good looks, best price...
stillen - most power gains, average price...
hks - expensive...but does include an h-pipe...looks almost identical to injen, except for the resonators...i dunno, if you want gains go with stillen, they definetly go above and beyond at times, that exhaust they have out for the sedan is mean, but in the case that you want it to look awesome while still getting good gains id go with injen, u can get it 850 bucks!

i just heard HKS hi-pwr on an 05 yesterday....man amaazing simply put....def. worth the price of admission...

injen has always had fiberglass problems....blows fiberglass onto pplz rear bumpers. not sure if it has been resolved w/ this newer revision...

Here's some HKS clips to help sway you one way or the other =)

https://g35driver.com/forums/intake-exhaust/84689-hks-sound-clips.html

I've had the Injen for @ 6,000 miles and love it. and NO FIBERGLASS ISSUES!