Originally Posted by SteveS

Re installation: As I installed the filter on the Alta enclosure, it slipped off. I did not trust it to stay on. Using a 4" crecent wrench, I bent the lip of the pipe which the filter clamps to outward. I found the 4" crescent to be narrow so it bent the pipe easily and fairly smothly. The filter did not slide off as I clamped it down. I think Alta should have made the tube longer so the filter would not slide off as easy as it does. I also constructed a small support out of foam to support the end of the filter as it is cantilevered and might "rattle" off eventually, without you knowing about it. I liked this better than the use of a coat hanger straddling the enclosure which ran under the filter which another poster showed, although that would probably work better. Just unsightly. My foam support does not show.

I was apprehensive about the noise of the Alta. It is not bad at all under normal driving conditions. Only when you hammer it is it loud. However, you better be paying attention to the road and not the music when you are full throttle.

In conjunction with the Pulley, this is a very effective and economical power mod.

Originally Posted by bgrpph

wow- about that whisle- and always wondered if i had leak somewhere. Couldn't find anything on MCO about this whisle. I've had madness with drilled out partition for last 6 months. Whisle seems to be more noticable last few months. Doesn't whisle all the time but seems to begin after full throttle- then continues most of time until just less than 2500 rpm then stops- gear doesn't matter but it doesn't whisle all the time.
Guess from Randy's post it is normal. Glad to finally know this. i won't bother mentioning it to dealer when i take it in next week for a sunroof rattle (when roof is open all way).