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2005 Chevrolet 6.6L Duramax LLY
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Description
We get a lot of calls and e-mails each day with various product, vehicle, and installation questions.Some are completely off the wall and can even catch us off guard at times, but many others are fairly routine, so we thought we'd post some of the most popular questions that can hopefully be a good resource for you.

Q: Does your HE351VE (Variable Geometry Turbo / VGT found on 6.7L Cummins) come with an actuator, and if so, is it pre-calibrated?
A: Yes, all HE351VE's we sell come with an actuator, and is pre-calibrated, ready for installation.

Q: Will a DPF (Diesel Particulate Filter) back system provide more sound to my truck?
A: Generally speaking no, the emissions equipment upstream will still act as a muffler.However, that doesn't mean installation will not help in other areas by improving exhaust flow.While minor, the benefits are noticeable, plus an aftermarket exhaust looks way better than the stock exhaust.

Q: Will an aftermarket "2nd Gen" turbo swap kit on my 6.7 Cummins remove the factory exhaust brake?
A: Yes, the stock exhaust brake is part of the factory turbo. When removing the factory turbo in favor of a non-VGT (Variable Geometry Turbo), the factory exhaust brake function is removed, as well.

Q. Why does it sound like my transmission rattles after I installed a new clutch.
A. That noise that you are hearing is called gear rollover noise. It is evident in all transmissions, which is the reason the factory originally installs dual mass flywheel clutches, as they will cut down on that noise. The G56 is especially bad because it has a large aluminum case that acts as a megaphone. It is a completely normal condition, but can be helped. We typically recommend filling the fluid up to the fill plug in the transmission, then pulling the shift tower and putting one extra quart in. That will significantly cut down on the gear rollover noise.

Q: Can I buy just EFILive tuning for my 2013+ Ram 6.7L Cummins without an unlock device?
A: In short, no. Beginning in model year 2013, if you're looking to tune your Cummins with EFILive, you'll need to "unlock" the ECM. Firewalls were installed to prevent aftermarket tuning, yet there are several ways to bypass this to allow the installation of EFILive. We carry the Edge Insight CTS2 Cummins Unlock, GDP ECM Unlock Device, and the Bully Dog GT with Unlock Cable.

Q: I'm looking at an exhaust kit on your website, but it doesn't state which cab and bed configuration it fits, will this fit my application?
A: In most cases, unless it is specifically stated as fitting a certain configuration, all exhaust kits on our website will fit all cab and bed lengths.Further, most kits will not fit cab and chassis applications unless otherwise noted.

Q: I'm looking at this 5" (or other) exhaust kit, but my truck only has a 4" exhaust now.Does this 5" exhaust include an adapter / reducer?
A: Yes, the exhaust systems we sell will adapt down to fit the application at the designated starting point (turbo back, cat back, DPF back, etc.) for a hassle free installation.

Q: What are EGT's?
A: EGT stands for Exhaust Gas Temperature, which is the temperature of the exhaust leaving your engine.This measurement is typically measured before the turbo to ensure you are not overheating components.For most applications, we recommend not exceeding 1300 degrees.

Q: Will the products you offer void my warranty?
A: Some parts may void your warranty and some may not.We recommend researching the Magnuson-Moss Warranty Act that specifically protects consumers when choosing to install aftermarket components on their vehicles, as well as consulting with your local dealer.

If you've got a question about your Cummins, feel free to give us a call and we would be happy to assist.