went to from 18'' bullet glass packs that ive run on the truck since new to 40s for a change of sound, they were too quiet for me so the super 10s went on today. didnt put my tailpipes back on yet incase i didnt like them so just put turn downs on it in front of axel. idle is actually kinda dissapointing, only slightly more rumble than the 40s and quieter than the glass packs, revving it in park isnt real impressive either imo. part throttle around town about the same as the glass packs as far as loudness but deeper sound. cruise speed is nice, once again like the glass packs but with a deeper tone. stomp on it and it roars, just what i wanted. i thought they would be louder all the way around but i like them. it has more noise in the cab but im guessing thats mostly from not having tailpipes. probably run them like this for a bit then put the tailpipes back on. the rest of the exhaust is stock 97 454 to the convertors, then a foot of pipe and the muffs with turn downs.