Originally Posted by wtmarshalljr
has anyone cut away any of the hood insulation around the DIY napa filter? To allow better flow?
I haven't but I know what you mean. My hood contacts my filter. I used a Baldwin PA2818. I think I remember reading where it is slightly larger than the NAPA and some of the other similar filters. I plan to research and look for a slightly smaller filter, if available, next time.
As far as tubo whine, I don't hear more either. I hear the blowing/sucking that the big filter does. It sounds real cool when climbing through the mountains like I did yesterday. (I did the wastegate delete too but really can't tell any difference. No gauges though.