Has anyone taken off the resonator box and capped it off with a PVC fitting, or are you guys going with all new intakes? If so which ones. And are there any other mods for the LLY such as Down pipe, not looking for full exhaust but would like to get rid of the cat. Any any word yet on computer upgrades?

My LLY is over at ATS Turbo as we speak, gettin' some love.They are using my truck to develop their new LLY exhaust. It looks AWSOME! It sounds AWSOME too! (It looks to me that the Lb7 exhaust has some different hangers than the LLY)


They are looking for the best way to do a compleate exhaust that will use an "Offroad Test Pipe" In place of the front section that holds the Cat. Then when I need to get it tested I can just bolt the stock section with the cat back in.


I havn't driven it yet but just heard it from the outside, and from inside the cab. The best way I can discribe the new "Kitty Free" system is "Mellow Big Block Chevy". I like my exhaust on the quiet side. This system sounds really nice. Not too loud, It just sounds Really Pissed off.

Most of the programmers are working on things for the LLY, but none have completed testing or are ready to release products. I think you'll need to wait for this summer based on my conversations with Edge, and some of the posts I've seen here from other members and vendors.


They not only need the time, but hot weather for testing programs to see how much heat they'll generate among other things.

We have complete Exhaust in stock for the LLY. The system is a cat back unit but if one were to buy the front pipe for our non cat. LB7 kit and install it as well you would be kittyless. Kit are Stainless Steel pipeing with a polished 304 Stainless 5 " tip. The programming is completed for two power levels and were working on the third power level. Once completed all we have left is our warm weather testing. So as soon as the weather heats up a bit more here in Southern Calif. it will allow us to finish up. We feel it's not worth the headake to let the programming out without the warm weather testing.

Ok, here is the info on the new ATS Turbo LLY exhaust....


You will have the ability to simply bolt the "Kitty" pipe back in place anytime you need to. Otherwise you can just use the "Test pipe".


The sound is Much better than I would have guessed. NO DRONE at all!!!http://www.dieselplace.com/forum/smileys/Clap.gif It is only about 10-15% louder than stock when outside the truck. When inside, You can hardly tell. The muffler is 4" straight through, No restrictions or anything to "Tumble" the exhaust flow. It is 4" stainless construction with a 5" polished stainless tip.


I can tell the turbo seems to spool up quicker than before. No codes were set from not having the Kitty. (125 miles later)


If you are like me and like your exhaust on the Stealthy but Very Healthy side of the sound scale, You will like this system allot!


Advanced Turbo Systems SLC Utah 801-263-0900

Well, I ordered my exhaust before I got my truck. Imagine my surprise when I saw the converter underneath! However, the LBY and LLY engine have the same hanger configuration, and the complete Dynomax kit replaced the oem exhaust system nicely. It now sounds more like a run-away air compressor. The turbo spools up much better now, and I have no check engine light without the converter. http://www.dieselplace.com/forum/smileys/Big Smile.gif

This weekend, I had a Flowmaster exhaust installed from the turbo on back removing the catalytic converter. The Duramax responded well, however the check engine light came on. Called Flowmaster for an explaination, they said to purchase a high flow intake and a hypertech programmer to clear the problem. The local Chevy dealer said they could clear the check engine light, but it would quickly return. Any suggestions?

The Duramax responded well, however the check engine light came on. Called Flowmaster for an explaination, they said to purchase a high flow intake and a hypertech programmer to clear the problem. The local Chevy dealer said they could clear the check engine light, but it would quickly return. Any suggestions?[/QUOTE]


I drove mine some more tonight (Flogged the crap out of it up Parlys summit) Still no Check engine light. It just runs like a Scalded cat!http://www.dieselplace.com/forum/smileys/Big Smile.gif


Check to see if something got disconected when they were doing the install. I'll bet that may have something to do with it.


My Transmission cable had to be removed when my system was installed. It didn't get reconnected before the engine was started. It threw a code... I had my dealer clear it. No problems since.


Let us know what you find....

My Transmission cable had to be removed when my system was installed. It didn't get reconnected before the engine was started. It threw a code... I had my dealer clear it. No problems since.


I disconnected the battery for 30 minutes hoping to reset the CPU to no avail. Went back to the truck accessory shop and had them check if they missed replacing a connector, which according to them they did not. Being this is my first diesel I took the conservative approached an had them re-install the catalytic converter. This resolved the issue with check engine. There are no sensors on the exhaust system, therefore how does the CPU know that the Cat was removed?

Did you find out wich sensor set the code?


When the Transmission code was set on my truck, I couldn't reset it by disconnecting both batterys. I needed my dealer to do it for me with the Tech 2. (He didn't even charge me for it)


Still no code set on mine. (over 225 miles later)


Find out exactly what set the code on your truck. Have your dealer plug in the Tech 2 and read off all codes that have been set. I just can't believe only yours sets a code related to the Cat, while others of us who have done the exact same mod have no problem. In fact my truck is much happier now that it can breathe.http://www.dieselplace.com/forum/smileys/Big Smile.gif

Thanks LLY DMAX, I found a local shop that has a Tech2 who will read the error codes. Maybe my best alternative is to return the Flowmaster and purchase the ATS exhaust?

I think your Flowmaster should work fine without the Kitty. I am just curious what is setting your code. Let us know what you find.

There has been talk about removing the cat and the egr not working properly. Whether this is the problem or not, I don't know. The same thing was said about the 6.0L Powerstrokes when they first came out and it turned out to be a bunch of BS. It will be interesting to see exactly what is setting your light off.

I think your Flowmaster should work fine without the Kitty. I am just curious what is setting your code. Let us know what you find.


The check engine code:


Insufficient EGR Flow Detected

I gutted my cat about 300 miles ago no codes, no lights, gained about 3 mpg. but left the stock exhaust on for now, thats the next upgrade while i'm waithing for the Juice

Does LLY = LBY, maybe just this week ?

G-day all, its a pleasure to be part of your foram finally. been trying for a wilehttp://dieselplace.com/forum/smileys/Big%20Smile.gif finaly got it to work. I have many questions to be ansered, and advice to give hope we can help each other out. question #1 where do i find a good turbo back exaust for my LLY id like to get rid of the cat #2 have any of you considered gale banks for your chip upgrades he makes an increadable settup for the LB7 155hp385ft its called the six gun diesel tuner. I would have got it, but my 2001 LB7 got totaled http://dieselplace.com/forum/smileys/Cry.gif #3 im big on lift kits had a 4'' trail master on the last truck loved it. heard lots of good things about RCD lifts they come with bilnstein shocks any comments.#4 PROPAIN INJECTION the good the bad the ugly tell me everything. more questions to come. Thanks for your input.

TTS and ATS make great exaust systems for your truck. The banks is good for towing, ok for the street. Edge and a few others are still in development stages for your truck. For the best power get the TTS. It's still in testing though as well. It's custom made for your truck. How ever it locks the PCM (trucks engine computer). If you have a problem, and GM sees it NO WARRANTY. I would get a second computer in this case. But we are getting deep now. This would be after a Tranny upgrade. Rancho makes a great one and so does RCD. Super Lift makes a good one that moves the track bar for the steering down and makes it very solid (good for traction in 4wd with out the worry of toe in and out problems and permature tire wear).Propane is good by itself or with a mild power tune. If you end up building big, Propane is an extra fuel and will advance the timing more than you want and BOOOOM. The sky is the limit. How far do you want to go? Super Diesel

Thanks Super Diesel, But dont be afraid to go as deep as you want Im right here with you. A few questions though, why does the tts system lock the PCM iv never heard of this, do other systems do this as well? As for how big well i had a duramaxamiser and a 4" flow master on the last truck I know now that the chip i had wasnt one of the best but i was happy with the set up and power gaines By the way does anyone want to buy my old chip it wont work on my new LLY 100hp and 180ft for 2001-2003LB7's I payed $1200cnd by the time i got it to my door ill let it go for $900cnd. Thanks again for the input.

TTS is the only one I know of that really locks the PCM, even the stealer can't get in. It is custom built for you truck off of your trucks build codes and tire size you run. TTS make it with three different power levels built in that you can change on the fly. A stock tranny can handle the first two, but the big one you will need a good tranny build to handle it so it dosn't trash the tranny. And then if you go to the Extreme program the stock tranny will handle the first setting only. You will definitly need a pyro meter what ever you do. I can get the stock truck to go over 1350 here in colorado, and thats with a good clean flowing after market exaust. As for the Duramaximizer, you can list it in the FOR SALE section of the forum. I'm sure some one will take it. Super Diesel