OrangeC20
Junior Member
- Joined
- Oct 19, 2015
- Posts
- 18
- Reaction score
- 1
- Location
- Walla walla
- First Name
- Reuben
- Truck Year
- 1974
- Truck Model
- C20
- Engine Size
- 350
Right now I'm running a 2.5" with a thrush turbo style muffler. One of my friends has a 4" he said he'd give me, but it wasn't on a old truck. I know it won't have as much back pressure but how much will that affect my power?