i have hf with a b16 my car was running smoth except for the blown shock in the rear driver side that was it. Then i dropped the car not even that much maybe 2 inches and for some reason the car vibrate like a mother ****** at about 3k to 4k and when i down shift. maybe cuz i have 4 different size tires with only 2 that have 60 sidewalls in the front could be warped or i didnt put grease on used wheel bearings. dont know?