Knocking Sound in rear (40+mph)?! [Archive] - Toyota MR2 Message Board

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This has been driving me crazy! Its a slight knock that sounds like its from the drivers rear. I only hear it at 40+mph with the windows up and radio off. It sounds SOOO suspension related. Ever since i put my HKS Hiper exhaust on i have noticed it... I never notice it with my custom (too loud) or stock exhaust. I have checked everything over and over again. The exhaust isnt hitting anything anywhere! I replaced the rear struts cause one was blown (thought that was it but it wasnt). I