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For those of you that are thinking about true dual exhaust on the 5.4l. Dont do it lol. I just purchased a 2001 f150 supercrew lariat, it had true duals on it when purchased. 3 days later I hooked my 800 pound car hauler and loaded a geo tracker. From a dead take off it barley pulled out of its tracks. I have had 2 other 01 f150s one with the 4.6l and one with the v6, both of them had more power than this one. After 3000 rpm though it started roasting the tires. Pretty much useless for pulling in current state. Will be reversing the true duals as soon as cash allows
We keep telling people that they don't want to change the stock exhaust system because it is already tuned for low rpm truck application.
But those rapped up in hotrod thinking forget those mods are high rpm, not low rpm torque and find out the expensive way.
The motor is not restricted to any significant degree below 5000 rpm.
Good luck.
Last edited by Bluegrass; Oct 18, 2016 at 11:55 AM.
You must be confused on what a true dual exhaust is. When you put an x pipe in it, out no longer makes it true duals. Any connection of the two pipes eliminates it being true duals.
Right - and I'm saying that true duals by your strict definition are not efficient, but if you DO put an X-pipe in, that's fine as long as the pipes are no larger than 2.5".
No confusion here - but you may be a bit confused yourself.
If you are pinched for cash, just put an X-pipe in your rig, keeping what's already there. The other option is a DI/DO muffler with an internal X.
I know what you are trying to say, but a system with a X-pipe or H-pipe is generally considered to be "true dual" these days. This is opposed to a system that uses a Y-pipe and a SI/DO muffler, that is not "true dual".
