i am putting on a super 40 series flowmaster tomorrow with dual 3" pipes. i had this exact setup on my f150 and it wasn't bad on the inside at all with pipes out to the rear. it sounded awesome on the outside, though. i paid $90 for the muffler through e-bay, it is a dual out/dual in and the muffler shop in sugarland tx. is charging me $200 for inst. and pipes. i will write back and take pic.'s for anyone interested.