Hey Dave what's your take on the combination of MAF's header and downpipes for the 3FE? I was thinking if I could route the exhaust system right I could keep it as a full dual, no cats (don't need 'em where I live), run through a pair of Flowmaster 40s. Not sure if it's really worth all the work that'd be involved (or the price for the headers and downpipes), but it seemed like an interesting idea to me. I would think that also with the use of an H or an X pipe in a dual system, you could retain the 3FE's torque as well as gaining the extra HP with the free flowing system.dd113 said:Some advantage but not worth it when installing on a motor in a truck. if you are rebuilding/pulling the motor it could be worth +- 25hp. Get the ceramic coated one and be supercareful sealing it up.
Did it ever leak from the manifold gasket, or just the collectors? A local exhaust guy in Spokane knows a few dirty tricks for sealing troublesome exhaust flanges and he might be able to help me out if I ever go the header route. It's a serious consideration, but hopefully I'll be ready to go diesel before doing a full new exhaust.Moby said:I ran the Man-a-fre headers on my 3FE for a little over a year. I spent the entire time trying to get them not to leak at the collectors (including multiple trips to a good exhaust shop). Finally I was about to cut the collectors off and weld in a ball-socket connector but Man-a-Fre agreed to take them back. This was really above and beyond on their part and I've gone back to them to buy other parts that I could have bought locally as my way of saying thanks.
The power gain was a little noticable on the top end (full throttle highway merging for example). I'm currently running the stock manifold (ceramic coated) and a custom exhaust from the manifolds back. I've got a flex joints in both pipes, a single dual entry dual exit high flow cat, and a dual entry single exit Flowmaster. This set up works very well and does give a noticeable gain in power (at least on an engine in decent shape and in good tune).
Good for you. You will like it.FJ40onNOS said:well im building a 2fe with is a 2f block on a 3fe head