well its good to get a fresh tune for just about any upgrade you do, whether it be a full exhaust, ANY turbo boost controller if your raising the boost even 1-2 pounds, new turbo, new heads, etc etc. Turbo timer doesnt of course since it isnt so much an upgrade to performance but one to longevity.
as for the octane booster, 91 should be fine unless your like pushing 400WHP or more. how much is a gallon of 91 octane up there? most stations here have 93, with some every now and then having 94. but with the prices mine doesnt seem to mind 87 (manufacturers spec)
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