weird sound from safari snorkelor not

[victor b]

G,day guys,
just had fitted a safari snorkel to my 2011 nissan str d22, and, before it went in to ol, the motor gave off this purring sound, now with it fitted there,s a slight growl. Is this normal. I,m new to 4wd and I apologise if it sounds stupid but this thing cost me a lot of dough(to me anyway), and would appreciate any feedback from you. thanks

 

[sparra04]

Yeah mate its normal

 

[terryc]

Normal. Read my sig comment.