yea i herd that it does actually slow down your car, maybe not slow down but def take away from your low end. For those who do think that it speeds up are probably getting fooled by the growl.
Who knows i can be wrong..

 

I don't know what 8-10 hp increase is coming from this intake but i would go with soem other more proven models.

 

The dyno looked promising but I wonder how the dyno would look after a little heat soak.