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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 01-19-2010, 12:41 PM
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Default exhaust question

So i was waiting on sticker renewal before i did this but aparently i dont have to this year, so i have been wanting to take my cats of my exhaust, and just have it straight piped to my super 40 flowmaster. Now when i was under there i seen there is 4 o2 sensors 1 before and after each cat. Now if i take out the cats and just weld in pieces of exhaust pipe to replace them will it effect the o2 sensors enough to where i will be getting codes left right and center. I already am getting a code thrown for o2 sensor #1 bank 1.

So looking for advice from those who know or have straight piped exhaust.

Then come next year i will just weld the exhaust with cats back in but will more then likly have header by that time and exhaust will be all different anyways.

thanks
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Old 01-19-2010, 12:51 PM
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Yes, it will cause codes for converter efficiency below threshold but there is the trick of welding in antifoulers and installing the downstream sensors into them. Several people on here have done it and say it works quite well.
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Old 01-19-2010, 01:23 PM
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So there is no easier way of doing this? Frig why do i hate hemi's more and more, too much electrical for me, i am just going to swap in a 5.9 haha
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Old 01-19-2010, 01:28 PM
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The 5.9 uses 4 sensors as well unless you plan to go with a carb. Honestly, I don't know that you stand to make huge gains by taking the cats out of the loop. Headers and a good freeflowing muffler will work wonders though.
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Old 01-19-2010, 01:30 PM
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What about like a set of magnaflow cats in place of my cats? Think it would make big difference like obviosuly they are designed to but i guess what i am saying is would it be worth it? Cause i do want to get headers and looking at like a stock replace shorty headers that come with downpipes unless i find long tubes cheaper then make up exhaust.

So what do you think about the magnaflow cats?
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Old 01-19-2010, 01:44 PM
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I haven't had any experience with them personally so I can't give you an honest opinion. I would look and see if they offer a flow comparison of their cats vs the stock units.
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Old 01-19-2010, 02:16 PM
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Well we will see what i can do...rig something up, but i am really contiplating swamping the hemi out for soemthing, just cant handle the hydrolocking every little bit of water that touches it. on my 3rd motor, and always having electrical problems codes going jsut because a sensor is wet.... i am thinking of building and old school hemi and putting it in or a 5.2L or 5.9L out of a 2nd gen ram.
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Old 01-19-2010, 02:17 PM
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Hydrolocking? What's going on there?
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Old 01-19-2010, 10:22 PM
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had a CAI on and everytime i hit water it splashed up at the filter and sucked up in the motor and boom hydrolock and rod through the block. So little do we say now i just use drop in K&N filter and have the box pretty well sealed besides the air inlet
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