I've been trying to figure out what I could do to get some more growl out of my HEMI without spending too much. I was considering the Blastin Bob mod for about $150. I recently asked a local exhaust shop about doing this for me, without buying the kit...specifically asking them how important the tips actually were. They told me they could do the mod themselves for about $100, without tips, and that it would sound the same. Anyone have any experience with cutting out the resonators and doing straight pipe with no tips? Do tips really make a difference in the sound?