Well after doing more homework, I've come to the conclusion I screwed up on my exhaust when I put the 383 stroker into my 98 Sierra. I used JBA Stainless Shorty Headers which have 1 1/2" primaries connected to the rest of my exhaust which is 2 1/2" back into a straight thru Magnaflow 2 in 2 out muffler no cats. I am now going to install a set of JBA Stainless Ceramic Coated Long Tubes with 1 5/8" primaries to the 2 1/2" exhaust but also add in an H pipe. That set up should yield me so better figures!
Once I get it installed she will go back on the dyno to see how much I actually gain compared to before.
Previous set up put down 250whp & 322rwtq @ 3800rpm.
Once I get it installed she will go back on the dyno to see how much I actually gain compared to before.
Previous set up put down 250whp & 322rwtq @ 3800rpm.