Re: HP to rear wheel with mods ?
Assuming the PC has been properly mapped to maximise the system I would _guess_ 5-10% over whatever it had before the system and PC. The air filter doesn't make a measureable difference as far as I'm aware.
The gearing doesn't alter the torque in any way at all.
It just allows you to get further up the tacho at an earlier road speed and thus able to tap into the horsepower sooner.
520 chain and lightweight sprockets reduce driveline losses due to the weight saving so you should actually realise an increase in hp at the dyno.
Your actual measured output is probably between 120hp and 140hp depending on who does it, the type of dyno, the operator's fudge factor and how well mapped the PC is.
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