when you're near the rev limit, ~6k rpm and up, do you hear a hissing sound from the engine? its loud enough for me to hear over my cai.

 

From in the car, no. When I open the hod and rev the car I can hear the intake hiss.

 

No hissing sound here. Does the sound you hear sound like air?

 

i know how a cai is suppose to whistle, but this sound is more like, i dont know, a high pressure spray? thats the best i can do. only thing in the engine now is a cai.

 

yeah thats what i was thinkin cause before the cai was in, the hissing wasnt there. i'm not really worried about it tho; everything looks fine under the hood.

 

well there are a few things that might cause it.

first, the CAI, tends to make a whistleing noise at a certain point. It has to do with TB position. At a particular throttle level, the air traveling past the TB valve reaches a velocity that as it passes through the TB caues the air rushing over it to produce a resonation or the whistle.

second, at higher RPM, your LS valve guide retainers ( i think thats what they are called) tend to loosen themselves. Not alot, infact very little. But once the valvetrain reaches the higher RPM levels the rapid movement of the rocker arms causes the slight movement that would result in a highspeed rattle. Nothing bad, just common.

hope that helped some