cmc

k I was told I needed new struts and springs on rear of my 2004 rx8 by mechanic who did compression test. took to a mechanic friend of mine and he says that they are fine. Not sure whats wrong but I know something is because when I hit bumps on highway I get a loud thump from rear end. also rear tires lean in at top not sure if that has anything to do with it or not. any info on this would be greatly appreciated I don't wanna put struts and springs on if they are not needed. I understand its hard to diagnose with the limited info I have on here but again any help would be appreciated. thanks in advance