The fellow that said “muffler” would be correct, about the only thing you’ll notice is a little more noise. Was akin to flipping your air cleaner lid over from days past. Where did you end up getting your truck from? Jim

64 Dodge Coronet 440. In progress
1998. Dodge Avenger. 8.35@165. 4400 DA
250” Neil and Parks Slip Joint. 7.36@183.
4600 DA
242" Mullis Dragster. 6.90@ 200mph