i am doing a little build up on my f150 it has the 302 and im starting with exhaust im getting long tube headers and re running the tubes to come out right infront of rear wheels im taking out the cats and just seeing what muffers you guys think i should use to compensate the back pressure i was thinking the supper 44's anyone else got a better idea

 

If you want it real loud them the Super 44s will do it, especially with LTs and no cats.

 

loud really doesnt matter im just looking for the back pressure to keep the low end poewr there cause with the cats gone the back pressure makes my low end drop a little bit im also going to be running two mufflers cause im not goin to connect after the headers for a little more info.


since im doing this should i run a dummy O2 sensor or just bolt the old one to one side or what? dont want to just rip it off and run codes again

 

Its not back pressure that keeps engines operating correctly. Back pressure is when you are coasting down hill and the engine feels like its slowing the vehicle down, manual trans mission vehicles experience this the most. What your trying to explain is Velocity, which is the pressure of the exhaust, and the Flowmaster mufflers are a chambered design, with baffle plates and hollow chambers, which if anything restricts performance as much as stock does. If you looking for performance, look into a direct flowing muffler such as Magnaflows, Borlas, Bassanis, Dynomax Bullet to name a few.

And yes to keep the CEL you sound make MIL eliminators to confuse the computer to believing the truck has cats.

 

well i ran a straight through exhaust on my truck for a while and felt the low end power go down till i put a thrush welded muffler on and it had better power and worried without the cats the straight through muffer will kill that power? may be wrong

and you got me on the MIL eliminators have never heard of it wanna explane a little bit???

 

What size pipe were you running and how was it ran?

 

A straight through muffler wont hurt your performance, its not a straight pipe, the pipe inside the muffler either is wrapped in packing wool to give the muffler affect and deaden some sound to give off a tone. And if the pipe is is right, you wont have any problems. 2.25" - 2.5" is the average size for a healthy running exhaust.

MIL elliminators just confuse the PCM to believe it has cats to kill the CEL. Google search it, or search here for the Gotts O2 mod and you'll learn how they work and what is needed.

 

i was running 2.5 inch tubbing with 2 cats and a glass pack muffler it killed power. but ill check that **** out thanks man