A couple of days ago I installed an aFe Cold Air Intake on my 07 3.0si, this one:
aFe 54-11602
At idle revs or below 3000 rpm you can hardly hear any difference but above 3000 rpm the sound becomes deeper.
I am definitely satisfied of the sound of the intake (especially when accelerating), I don't feel an increase in power, but that wasn't why I bought one.
Only when driving at constant speeds on the highway (cruise control) at a constant speed between 3000 and 4000 rpm, the noise is a little bit too much.
It's a monotonous sound that overwhelms everything, once above 5000 rpm the sound level is acceptable again.
So my question; can someone explain why there is more sound between 3000 and 4000 rpm than in the higher revs?
Or even better, does someone know how to make the intake a little less noisy?
On the net I found some things about intakes:
- the shorter the intake tube, the more sound (the aFe intake is exactly the same size as OEM).
- at only one site the aFe intake was described as loud
- a smaller air filter would be quieter
I suppose I installed everything correct, but just to be sure I will check tonight and do a test run
