Totally normal and love the sound!
My exhaust is all OEM BUT I have a Magnaflow CBE (with resonator), CFM HFC (the $399 one I forget if it's the street or race but it flows better than their other HFC for $349) and today ordering CFM's flex pipe.
I've loved the exhaust popping noise every since I bought my SVTF but I'm sure I'll be loving it allot more when my full exhaust set up is installed next week.
-2002 Sonic Blue SVT Focus; #1200 (Purchased 10/2011)
-2000 T-Red SVT Contour; #1089 of #2150 (Sold 10/2011)
-1998 BDP Subaru Impreza 2.5RS (OEM gold wheels) #1595 of #1695 (Sold 1/2010)