This is definitely the never ending story.
I'm fascinated that Hoist has more or less now decided to go the PCIII, duals & K & N A/C route especially when Speedfreek and co. have categorically stated that they have NEVER had any issues with the SERT route.
Stock open back A/C, SERT and Rinehart Duals kicking out 99hp/118T/Q sounds pretty good to me, even allowing for a minor Dyno adjustment of 1-2 HP.
My Dealer has stated that as long as they do the installations they will guarantee the work and my warranty will not be voided. Sounds like an all round better bet than having to take the PCIII on and off and running the risk that they may find out that you have it via a third party or other source (chit happens !)
What a discussion this is - I'm glad that my CACO SERK is not due for another 8 weeks - maybe we'll have a resolution to the problem by then.
Though I think I'm about 90% on the way to my answer !
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Nige