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if id run a 4 or 5in mbrp exhaust for down pipe back getting rid of the cat... im not sure if id run a muffler or not im just checking if id do this mod would the check engine light come on or will i be fine...... my trucks 100% stock with 120k 04.5 lly btw
 

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You shouldn't have any lights to worry about and it should sound pretty nice I like the way the llys sound
 

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the llys sound good but.....if you have any of the following dont put on the 5"...a quiet nieghborhood....sometimes like silence.....live in cali.....have a newborn baby.....and last but not least a naggin wife.....lol oh and etc...
 

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no i never had any issues when i put my 5in turbo back on no check engine lights or anything, and its not even very loud just in normal driving my parents live in a tight neigbour hood ive had no complaints even with all the early morning starts and warm ups but then again im not trying to annoy anyone
 
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