sounds good and will sound great with the LS9 cam

 

Truck sounds great!

 

Sounds Awesome through that cat back! I want to get my hands on a stock denali exhaust and dump it. With the resonator and muffler you have no drone still right? If I'm going to change exhaust set ups I want to make sure I wont have any drone.

 

With the cutout closed there is no drone inside the cab at all. From idle to 2200ish rpms it sounds exactly the same as stock. Above that it is noticeably deeper tone and slightly louder. Enough to notice a difference, but not obnoxious at all and you can still hold normal conversation.

With the cutout open, it sounds like a racecar. Lol very loud in the cab with drone at certain rpms. But it sounds AWESOME. Lol

I'll try to get a vid in the cab with cutout open and closed and post it.

 

Just a little update. I figured out that there was a small piece of rubber from the gasket in the way of the cutout and keeping it from closing all the way. I cut that out of the way and now the valve can fully close up. Now it sounds just as quiet in the cab as it always was stock, even at higher rpms.

Also, I received all the stuff for the the ls9 cam and underdrive pulley in the mail. I can't work on it this weekend because I am going out of town to visit family, but I will start next weekend. Gonna do the valve springs next weekend and then the actual cam install the weekend after. I hope it runs better after the cam, pulley, and tune cuz it still feels like a turd right now, LOL. I'm contemplating about going ahead and doing 4.10s before the tune also so everything will be calibrated for them, but I'm kinda on the fence. I can install them myself so they aren't that much added cost and I know they will be a nice gain performance wise, I just don't know if I want to negatively affect my highway mileage. Right now I'm getting 18 mpg at 75mph (hand calculated), even without a tune.

 

oh trust me its gonna run like a monster !!!

 

Update: Got the cam in successfully. Getting tuned right now. I'll post up some vids when done.

 

Nice drop!

What was the part no for your MIT?
I got one, but it fit terribly and would vibrate loose from the throttle body, so I removed it. What you have is completely different than what I had. Thanks

 

Some good news, some pretty bad news.

Good:At WOT the truck runs like a Kenyan on crack.

Bad: I think my torque converter is toast.

After installing the cam, i went for a short drive and everything was ok. By the end of the drive there was a small stutter at part throttle. i figured it was just because of the new cam and not being tuned. Then i go to get tuned, and my tuner does live street tuning, so we went out on some back country roads and did all the WOT tuning. it ran great and the stutter problem magically went away for a while. Then we went in town and did all of the part throttle, regular driveability tuning. That's when the stutter came back, and got progressively worse. Then we figured out that it was a problem with the TC. He had it locked out while we were doing all the WOT stuff but when we did the normal driving tuning he turned it back on. As we kept going we realized that as soon as the TC locked up, there was a noticeable and constant stutter. Then it started getting progressively worse and got so bad that it was a bad vibration, made the truck stutter very badly, and you could even hear vibration (almost grinding) sound coming from the TC whenever it was locked up. I didn't feel comfortable driving like that at all and felt like it was getting bad enough it might completely blow up or something. So at the end of the day I just had him tune it out completely so i can drive the truck til i can get this problem fixed.

The question is, what could have happened? Anybody ever seen this before?

 

I know just enough about the 6L80 to be classified as totally ignorant, but I had something very similar happen once on a built 700R4 behind a built 400 smallblock. It sounded exactly as you describe, and was finally traced to a little blown o-ring somewhere in the tc. Replaced the tc and all was well. Good luck!