Thank you so much for the response!! Very detailed and clean and really cleared up the problem for me. Question: I thought the whistling noise came from the SADS bushings being worn out or was I misinformed on other forums? Either way I will change out my SADS bushings and if that doesn't fix the whistling then I'll invest in an exhaust system. I'll call my mechanic tomorrow and worst case scenario I'll just go to my local dealer and have them take care of it.

Little background on my Previa. '97 with 78k miles on it, evergreen pearl and leather seats. I love it!! Just plastidipped the gray plastic bumpers black!

I plan on buying another Previa, a 5spd manual one. I found one for $750 but it had a blown head gasket just like yours and I didn't want to deal with an engine swap/rebuild project on a car this unique about its engine placement. But you should consider it, less mileage and looks pretty clean.