on my 93 f150 4.9l i recently added a longtube header and have just two glasspacks running back and out the side before the tire. no cats, straight piped basically, no egr or AIR pump hooked up. when i put the exhaust on with no o2 sensor it sounded fine. after i put the o2 sensor on it runs good. i dont think this has anything to do with the o2 sensor.


but it sounds like it is just blowing air out. when i start it up it has a good tone but then it just sound like air blowing. even when i idle at a stop light or something. is their something that could cause this?


when i got the collectors i used those gaskets that they gave with the kit witch was like the small metal/paper gasket. now i just got these to replace them to see if this works

Flowtech 10025FLT - FlowTech Real-Seal Collector Gaskets - Overview - SummitRacing.com


i dont know if anyone else out thier with a 4.9l has the same problem?
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I had problems with my collector gaskets on my Camaro until I put on those aluminum ones.

 

The aluminum is definitely a better option...once you put em on.....make sure you retorque em after a bit of driving....

 

i was thinking it was some leak on one of the gaskets someplace. i will see when i put these ones on if it will stop