Not worth the money, no noticeable improvement at all. I had installed the Airaid one @ a dealer I worked for and yes they do whistle and it gets annoying! and I was just road testing them!
from what i have heard it can depend on alot of the other mods you have as far as intake and exhaust, if you really want to give it a good power gain, do new intake, tb spacer and full exhaust.
this may just be the tuner car coming out from me but my intake on my celica whistled and i got asked all the time what kind of turbo i had. granted this was a toyota product with only 4 cylinders and not 8
Well, I have exhaust, not a full system just 1 in 2 out with 3" tips. I am working on getting a k&n CAI but havent been paid for playing in our basketball band yet. So once I get that money I will likely be able to get my intake and go ahead and start looking for spacers then due to the fact that they are around $60 shipped. It is not so much that I am looking for power gains, more so on the efficiency gains. Every little bit will help. However, you know, if I do gain power I won't argue
both the throttle body spacer and the hypertech are a waste of money... heh...So on a 5.3 with hypertech, CAI, cats and exhaust, a TBI would be a waste of money?