Sure man.
There are loads of upgrades available for the impulse, have a look on the net and purouse whats on offer.
I used to own one myself and there good markers, you won't have any trouble with the maxflo, it's a very good reliable reg.
on your gas thru grip, if you take it completly off from the body don't over tighten it when you put it back on. If you do when you gas it up it will tighten slightly further and over a prolonged period of time you will strip the thread and it will piss out air continually (I did this myself which is why my impy is sleeping with the fishes).
dont be afraid to take the hammer and ram out as i was very tetchy about taking mine apart, as i did'nt know what i was doing.
But they are fairly simple guns and the more you take it apart the more you will learn about it, just dont open her up to frequently or you'll just get dirt and dust in it.