My Universal 10 (in an O'Day 272) seems rather loud while motoring, in comparison to others I've heard in passing. Can anyone recommend a good source of sound insulation that could be used to line the engine box / step area. I've checked auto parts places around my area, but they don't carry it. West Marine has only 10 square feet for $ 70. - yikes!!! There must be a more economical source. Any other suggestions? Thankks, Jerry B.