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It does sound like you have a good tuner. An ECU is an ECU (in general) and in practice are only as good as the tuner. For example, a tuner who is totally familiar with any ECU will do a better tuning job with that ECU than say another guy who wants to use a Motec but never has before..... Does the "Stinger" have: knock control? boost control? Auto-tune? Closed loop?What grade (RON) fuel are you using? I expect with US fuel and 10 psi you are only seeing < 120 hp at the wheels?I run mine on 98 RON and at 18 psi, I get 200 hp at the wheels (similar climate to Florida).SAND... You might want to try a Centrifugal type pre-filter and double socked filter after that. Try to stay away from oiled types as they can play havoc with your AFM if oiled even slightly too much. Personally K&N aren't good enough for the street, let alone sand. Another thing to remember, get a filter that's big enough to still flow what the engine needs when the filter is half clogged.