i hollowed out the muffler not mufflers this Mack only has one stack. if u listen to other vids of this mack u can tell the difference. i also raised the shifter bout 8inchs thats all i could do with out cutting and extending the lines
Shifting: nice vid, but how you driving seating on floor of the truck ?
Shortthrovv: Every truck driver I know including myself sits on the floor. You just wouldn't understand unless you drive yourself
Frank:how did you hollow out the mufflers?! I have 2 dynaflex on my RD 688 and Its too quite, it sounded nice with just one now since i added the second one its really quite.
