I don't think your tuner will reach 9 hp with that kind of setup. Even with all the modding/tuning etc. But hey i love to see different. You might be interested in the following graph.
The lowest score is from a complete stock Piaggio Ciao which over her in Europe has a 12/10 SHA carburettor. The other 3 graphs where from the 3 best exhausts we tested on the following engine; Polini Evolution cases with 19mm Carb, 43mm DR Evolution, Polini high compression cylinder head and a stock pointer ignition.
Although these where all slap on parts and nothing fancy had been done to tune this engine. Only with these 3 types of exhausts the engine hit just over 5 HP on a Dynojet. Anyway these scores will give you perhaps any idea what to aim for.