I am running a new 2005 GMC Sierra SLT EC LB D/A stock. I tow a 7700 trailer and would like to add two gauges. A boost and pyro.
I am not keen on the pre turbo mounting atleast not at this time as concerned about getting it installed properly with no metal into turbo and also warranty issues. I have a couple of dealers that may try to get sticky. Further I just since not chipping the vehicle just want to keep eyes on temps and cool down.
Can post turbo be at all effective?
Also has anyone actually heard of a turbo probe coming off and going through turbo on non competition or modified unit?

Thanks
Bob

I too was worried about going pre-turbo, but after doing more research, I'm going to go ahead and install my pyro pre-turb. It seems like nearly all diesel gurus agree that pre-turbo is the wisest choice.

No one has reported probe problems here that I can recall. In as much as stock trucks can go over 1250 degrees empty, an EGT is a really good idea. I have both pre and post turbo, and under some conditions they are 500 degress apart. I would HIGHLY recommend pre.

Well, contrary to the most popular mount of pre, mine is post. I have no chip, and I feel this gives me a better idea of the turbo temp. I'm not worried of melting pistons running stock. If you would really rather have it pre but are worried about drilling the manifold, don't be. Just be sure to wear safety glasses. I too can not recall anyone having a problem doing it.

Steve

Although I dont own a Duramax yet (stuck in Iraq, waiting to order an 06 before I leave this place) I do have a 300ZX Twin Turbo at home that is making 600HP at the wheels. I would definelty recommend putting the EGT Probe before the turbo. If you are concerned with it getting hot and breaking you might want to search for probes made with Inconel. I believe they are about $36 a probe. Inconel is an amazing metal that will stand up to unbelievable amounts of heat. My exhaust manifolds are made out of inconel ($$$). Hope this helps.

the easiest and best place is pre turbo on the manifold. You want to know the temps before it gets to the turbo. Go to the do it yourself secton and find the how to document. Its fairly easy, believe me.

just a tip.. as you are drilling the manifold (if you decide to leave it on while doing it), right before you think you are all the way through, start your engine then finish drilling. Make sure you are wearing saftely glasses and the tiny strips of metal will just fly out of the hole-same with tapping it. Plus, the manifold metal is so soft and the peices are so small it won't damage the turbo anyways since its at idle there is no load and little to no impellar movement.

It takes less time to drill and tap the hole than it does to remove the inner fenderwell liner.

You want PRE turbo..I personally would want no guessing as to what my temps are installing it anywhere's else. This is small insurance for your 40k+ truck.

just my $.02