Ok the bike is at home and is very nice!
But it's less comfotable than the America. Maybe the handlebars are not in good position and of a comfortable shape.

I've ridden for a while and can write some impressions...

The bike is very poor of torque at low ranges than the one delivered by my ZRX1200 and my previous '04 XL1200C.
Yes I can't ask the same torque to an engine with 400cc less than that bikes.

But I see it has an awesome progression over 4-5000rpm. It doesn't seem a bike with only 52 wheel HP!!!
In the paper the '04 XL1200C has 80bhp (with tax payd) but it hasn't the same speed and progression of this 790 engine!

I notice lot of backfiring into the pipes releasing the throttle. And a flat spot between 3000-4000 rpm.

If low end torque was an issue maybe it was better for me to buy an 865 instead of a 790. I'll look after if a 904 kit can correct this.

The bike is stock of course, but I want to ask what in details the pipes+airbox mods will correct?
Will the bike receive also more oomph at low end rpm?

What your impressions when you removed this restrictions?

I've the impression there's a modern and quite sport attitude engine in the wrong bike...