I am still hearing the sound under the dash when reving engine........I have never in my life had such difficulty with air in the system, could it be that the core is still got quite a bit of blockage and that is what is causing the noise? or is something in the core damaged and rattling around? I am really getting frustrated b/c despite my time and money involved, I am making no progress.

97 Montero SR w/Mitsu Adj Shocks & Rear Diff Lock ARB Front Diff Lock 4.9 Ring/Pinion 3.15 transfer box 43:1 crawl ratio 2" suspen lift 2" body lift 2" Gas Tank Lift 35x12.5 MTRs 15x10 Wheels Rock Sliderz ARB front bumper w/12k winch Custom rear bumper