Motor inserts installed

Yahoo!!! All 4 inserts installed! Let me first off by saying that the car sounds meaner. The vibration in the car is pretty cool too. Its not as bad as i expected, but the car handles so much better, as if it was brand new. The car seems to have a little more power as well. The best part is i called all around to do the lefty and right inserts and they wanted to charge me 75 for each so i was like fuck that. I took it to the family mechanic (very trustworthy and exerienced) and had him do it. The only problem was that he wasnt able to do three inserts and he claimed it was the wrong size. So he had a friend come over who specializes in dsms, acuras, and Mazdas and he knew exactly what to do. It took them 5 hours to get the two son of a bitches off. The other two were easy. When i got there he didnt wanna charge me anything and i convinced to charge me something. So he said just make it $75 and i was like cool. So i gave him $75 and a $25 tip for keeping the hookup. Pretty sweet i may say.

Here is the problem though......
Everything was done correctly and i now know that it is not the motor mounts that are making this knocking sound when i go over bumps. the sound coming directly under me or in the enigne bay sounds like a 2x4 is on a piece of metal and when i hit a big bump it falls over. Its really weird. Tomorrow im gonna lift the car and see if anything is loose down there. Does anyone have any suggestions on what this might be. Please help guys, its getting really annoying when driving. Thanks in advance!!!!