[Robgmcman]

I have a smog question for anyone who may know. I have to get my truck smog tested here in CO. I have a 05 2500hd dmax lly and I have the banks system on it. Do I need to take that off before I get the truck tested or will it matter?

 

[DMAXITOL]

Having experience in Ca. with gas rigs I would say yup, better remove the stuff temporarily. It may start a process you really don't want to deal with! IMHO

 

[lakingslayer]

I'd remove it because you may fail visual inspection. Are they going to put a sniffer up the tailpipe and run the truck? Even on level 0 the edge still adds timing which may make your emissions fail.

 

[ssduramax]

I have a smog question for anyone who may know. I have to get my truck smog tested here in CO. I have a 05 2500hd dmax lly and I have the banks system on it. Do I need to take that off before I get the truck tested or will it matter?

You state that you have the banks system, doese that mean "cat back" or did you remove the cat?

I woud say that if you still have the catylitic converter, you should be ok. I didn't see any other modifications you may have?

 

[opfor2]

I agree with the above if you just have the cat back system you should be OK.

 

[Clyde in Colorado]

Rob: Call 719.260.6629 and ask them. They'll tell you what's up. It should be the place you're going for the test anyway. Plus you need an appointment, so you need to call for that. They're the only test place in the Springs.

 

[ENCS]

I agree with the others on the CAT. If it is still there you should be fine.

 

[Robgmcman]

Thanks everyone for the infromation i will call and ask what they think. When in dought take it off i am going to guess. I do have a cat but i also have the banks 6 gun.

 

[Clyde in Colorado]

Rob: I was at the e test business yesterday, talked with the owner. He said if you can get your state of tune reasonably close to stock it will be just fine. It has to be able to run the dyno load test for the required duration without kicking out too much heat basically. If a check engine light comes on during the tread mill run, then they have to fail as well. The DM's generally don't give them any trouble because of the variable rates of tune. Permanent chip type instals are an issue.
Trucks manufactured with a cat on them must have it on when they show up for the visual inspection.