Well its hard to say which one is better as there are people on both sides of the fence about this issue. Speed density is done without the Maf (mass air flow sensor) as you mentioned. To put it simply basicly the engine runs of set fuel tables rather than relying so heavily on the maf and compensating for outside conditions. Many consider the Maf a restiction once you start making alot of power since they only go up to 90mm (100 mm ones have been recently released). Really what it comes down to is the maf allows your car to adjust better for altitude and temperature etc. However with a good speed density tune especially in a boosted application like yours you may never know the difference. I suggest you check out the tuning section on LS1tech and read up on it and decide for yourself. You may also want to talk to some tuners you are considering because I am far from an expert on this topic. What kind of power are you looking to make?
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