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Discussion Starter #1
the first thing i noticed when i was test driving my truck before i bought it was how quiet the duramax was...which made me want to customize the exhaust asap...i recently bought a frontpipe back 5" mbrp system(no cat, with muffler) and i was wondering if i cut the muffler and went to the straight all the way if the idle would be significantly louder...the new exhaust is by far better than the stock of coarse but was pretty dissapointed when i first started the truck after the new exhaust...thanks for your help...
 

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It will be louder for sure. I am not really familiar with the lly, but I know that on the my LBZ and on my LB7 that when I went total straight pipe it was louder. Removing the cat will make all the difference in the world.
 
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