A stock 318 with 4bl? I wouldn't waste time/effort or energy into headers, you Will feel no gain on a stock 318. You are opening up a can of worms/headaches for no power gain.
This is completely wrong. 100%. Sorry buddy, been there done that just like 318willrun. Headers will add torque & horse power and mileage.
I suggest one of two headers. The above Doug’s headers or the Summit headers. The Doug’s do not have any tubes that go below the steering linkages on the drivers side Wollock is a big big plus for me.
All headers except the Doug’s and TTI headers have 3 tubes on the drivers side that run under the steering linkages and often hit the ground. If your suspension is weak and/or low the tubes will hit the floor and get crushed creating a weak point for rust.
The Summit headers have fit well for me and have a thick 3/8 flange like the Doug’s and TTI headers. But have the draw back as I stated above.
As far as exhaust goes, I have used the Jegs and Summit exhaust that goes from the headers to the bumper. I’m t fit very well with minor trimming. It’s a 2-1/2 exhaust with or without mufflers, your call. The mufflers within the kit are good to a little more than 400hp, no problem.
