You do lose bottom end with dual straights. I've run them for years and don't notice it until I hook to a trailer. I can give up the small loss for the sound, but it will be noticed with weight pushing you. You may not with the single straight pipe. I've never run that.
Rich

 

Your "ear dyno" is no way to tell if there is a loss, the sweet sound makes your truck sound a ton faster, but believe me boys, it aint. Its been proven time and time again.

But a lot of people just want that outlaw sound, so go for it.

 

What about seat of the pants dyno?

 

dont feel seat of the pants untill 20HP ish... so yeah you give up a few ponys and a few Ftlbs but not enogh for the butt-dyno haha.

 

 

i have no muffler and dual 2 1/2 pipes out the back it sounds great and no poppin unless she is cold