Personally I think the noise is quite a nice touch! Personalises the aircraft a bit and what's more you feel like you're actually flying! I mean, can you imagine a PA28 with minimal noise? How boring would they be!
PS - Was surprised to go all the way from Manc to Madrid in 146. Also done EXT - AGP and it seemed to make it there with all 4 engines still running. I imagine it's the furthest end of the range though is it? Full loads on both flights and return as well. Impressed!
Edited for appalling grammar. My Mum would be horrified.