I want to install a performance chip on my 03 FLSTSI.

Does anyone have any recommendations as to mfgr, model, dos & don'ts, etc.

Thanks all.

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that's like asking which oil is best. :-) you'll get 100 different answers for 100 different reasons. the bottom line is if you've done any modifications to the bike at all (slipons, high flow air cleaner, etc.) you'll be wise to put some sort of tune on it, whether it be by yourself or an experienced tuner. It will only help with the fuel management and air flow of the engine. The fuel management models are by far the least complicated and more user friendly on up to stuff like TTS, SEPST, etc which allow you to do your own tunes by riding. There are a ton of differences between them all and you'll need to educate yourself on each one before you make your decision.