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Trying to get some info. My truck currently has a flow master 1 in 2 out muffler and tips. Still has stock cats and all 4 o2 sensors. Is the only way to get rid of the cats by going headers back? Or will that still trip my engine light to come on. Truck sounds decent now but I'd still like that added deeper sound with a bit more response. Any ideas or recommendations would be great.
 

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If you remove the cats or hollow them out, it will definitely trip the check engine light.

To get more sound you can try the following:
Replace cats with hi-flow cats (possibly a larger diameter than stock)
Change Muffler
Upsize Exhaust Piping

I'm not sure how restrictive the stock cats are on the 3rd gen Ram. It's different for every vehicle. Chances are you will here a difference in sound but not a noticeable hp increase. A good set of headers in combination with hi-flow cats will give you a good hp and sound level increase.

My advice is watch YouTube videos where people post there exhaust clips and copy their setup if you like it. Make sure you are listening to 3rd gen hemi rams and not 5.9s.

Btw, you might try posting in the 5.7 hemi exhaust disscussion section. This section is for 5.9L.
 

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Also. Is there any truth behind actual hp or performance upgrades from adding a throttle body spacer?
Not a bit. Adding a spacer is useless unless your going to do something else like add nitro.
 
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