I posted in the past about my issue with the HKS exhaust i purchased making a vibration noise. THmotorsports is not going to help me out, and it seems HKS USA is... MIA.
Im about to sell it for half price (only hear the vibration during heavy acceleration)
Or have my shop do some surgery on the muffler to try to find where this noise is coming from..
Any suggestions im losing patience on this?