Put a cold air intake on it. On my last one I installed an S&B cold air intake and changed the S&B filter out to a Donaldson Powercore filter to make it filter at a higher level of protection.
Then leave it as is.
You could spend your money on a CAI & or remove the turbo resonator (the pastic box that says 'Duramax 6.6' on top of the engine) & plug it, but you wont hear much noticeable turbo whistle.
Really won't pick up much noticeable sound, unfortunately, without deleting and tuning it. MAYBE a cat back exhaust would help, I haven't looked into them at all, but may be a place to look. Regardless the air intake is beneficial and definitely worth the buy
You can do it yourself, it's super easy. Around $1000 just for an exhaust and tuning, I'm not sure who all is writing LML deleting tunes anymore, I know Kory from PPEI still does though. If you got a lot of time on your warranty, then I would reccomend keeping it. But if you got the need for speed, and the means to fix it if it breaks (CP4 failure on the LML is common) then delete it and for peace of mind should get a cp3 conversion kit.
But deleting and installing the exhaust and tunes is childs-play work that any first-timer can handle
Ppei, motor ops, Tony from ridge runner(moonshine), josh Harris has tuned a few that's running quite well. Sure there are others but those are the bigger ones who are more well known
yeah you gotta make a gut call, cause once you delete theres really no way to revert it and get back under your warranty. maybe ride it out for another 30-40k and see if anything is gonna break prematurely
I've heard a lot of good things about the duramax that's coming in a few years. After 30-40k I'll opt for delete or that. I heard it's going to be quite a bit stronger than the current version.
So, did you get the cold air intake? Did it feel like it helped in performance? Did you get more whistle? What intake did you get? Thanks!!
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