I am putting a true dual straight pipes on my truck its a 1993 gmc sierra 1500 5.7L 350. I am putting cherry bombs or also known as glasspacks.I am trying to determine if i should get 18in or 24in glasspacks. Which would you chose?

 

Why does no body ever help on this site?

 

I found the larger the pipe, the better gas mileage I get. You get less blow back in a larger pipe. Ultimately it is your call though. Good luck.