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wonder if they are the "newer" ones, or old originals? there's gotta be a reason that the original ones "whistle" while the replacements ( are they a 997 part now?? ) don't.
IMO why change the part to still keep the pentosin lines in place. Remove it all and do OEM gt2. The BBI unit is okay and works, but if you're gonna do it, do it 1x and the OEM way.