I live not far from Jim and I had him put the airbox and upcharge pipes in. I really believe that there is a noticeable difference. I did have problems with the upcharge couplings blowing apart, but my latest cure seems to have resolved this. I cleaned the pipe with alcohol and then applied a ring of double faced tape. The rubber coupling just fits over this and when the clamp is tightened it seems to result in a good seal that so far has stayed put after serveral WOT tests.
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