Pacific Northwest Four Wheel Drive Association

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thebenreilly 11-11-2009 06:03 PM

exhaust outlet before/after rear tires?
does it matter where i put my tailpipe?
before the rear tires or after?
i heard if i put them directly out the back then the air drag will just pull exhaust back in while i'm driving.
i just don't want to smell it while driving or sitting still.
what is the best place to put my exhaust outlet?
rants? raves? ideas? anyone?

zbd74 11-11-2009 06:27 PM

What kind of rig?

thebenreilly 11-11-2009 08:43 PM

84 cj7

Art Waugh 11-12-2009 11:25 AM

Lots of folks exit the sides in front of the rear tires (especially with fenderwell headers) Tends to be a little noiser for the driver/passenger than an exit behind the tires. More pipe and labor in an exit behind the tires, and pretty much need to go inside the frame rails to avoid issues with tires. Side exit will help with airflow sucking stuff back in from the rear.

thebenreilly 11-12-2009 12:02 PM

i think we're leaning towards the side exit exhaust. we're still measuring and mapping, i guess it also depends on how much room i have left after i put two cats and two mufflers under it.

Art Waugh 11-12-2009 12:46 PM

Unless you find super short cats and mufflers, I doubt you will be able to exit in front of the rears.

zbd74 11-12-2009 09:05 PM

I've a slightly modified '80 CJ7, there's a two into one 3" exhaust that stays between the frame rails, and is cut off underneath the tub in front of the rear axle, pointing slightly problems with exhaust smell

thebenreilly 11-30-2009 11:13 AM

on the subject of possibly not having enough room to push them out the sides. is there a certain distance i have to put the cat away from the muffler or can i cram them really close together? chiltons is not really telling me that much on it.

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