I've been looking into getting some flowmaster scavancer collectors and some straight pieces of tubing to replace the banged up tubing and collectors on the bottom of my headers.

How do you go about installing the FM collectors? I know you start of by cutting off the current collectors, but I'm confused about the welding process. How do you weld the enclosed area of the tubing. Like where the 4 tubes on the collecter get welded onto the 4 tubes from the headers, how do you weld the middle parts?

I'm not planning on welding these myself, but I'm trying to figure out if this is a really tricky thing to get done for an experienced welder?

Thanks.

You can't weld it if you can't reach it. I use slip-on collectors and just tack the outside where I can reach with the wire.

Hmm, sounds tricky. Guess I'll just get some new headers or something.

The scavenger collectors are a good item,just a little more than welding in place. Notice that they are really a tri-y collector. Into each of the "y"'s you want combine the non-sequental firing cylinders to get the "scavenge". On the pass side that would mean that #2 & #8 go into one y and #4 & #6 into the other y. On the driver's side: #1 & #5 into one y and #3 & #7 into the other y.

Done properly they should boost low to mid range torque.

Thomas

I have a set, had them welded all around from the outside. Prior to welding I applied a very high temp sealent (use on turbine engines) before sliding the collector on the header pipes. No leaks at all. The actually come with a set of weld on tabs with bolt holes, slip on and bolt together. I guess you could do that and score some high temp sealer.

I cut a diagonal piece off each tube end of the FM collector which created a window where I could weld inside the pipe to seal the part that could not be welded from the outside. Then I welded the window piece back on afterwards. Now it's fully welded, half inside and half outside, strong as hell and no leaks at all.