On the exhaust have you noticed a change then? not sure if its in my head but since fitting the remus it seems slower some how...
Not in terms of power, my engine has loosened up nicely feels good for the power and perkeier than before fitting, occasional when dawdling (not very often) if it feels like it stutters.
With the Remus if you don't run with the valves fully open I think it restricts power a little, sure I read that somewhere. I have been really pleased with Dottys old HKS, now its sooted up sounds sweet not too loud with a couple of pops when I'm really on it.