GM Diesel Trucks & SUVs 

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Pictures of our 6.5TD truck

Performance Data

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Discussion
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Recommended
  Products for 
  the GM 6.5TD 

6.5 PDC: Pump Driver Cooler

6.5 PMD / FSD Remote Harness

Gauges 

6.5 Dash Mounted Adjustable FUEL Control

Transmission Control 4L80E

All Hi-Flow Air Filters

6.5 TD Performance Cool Air Intake

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FOAM Air Filter WARNING

6.5 TD Turbo Downpipe

Performance EXHAUST Systems

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COOLING:
WATER
Mist Injection

Aftermarket
Fan Clutch WARNING

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6.5 TD Intercooler
ADVICE

Dual Auxiliary Electric Cooling Fans

6.5 Hi-Flow Dual Thermostat Cooling Upgrade

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6.5 Oil Cooler Hoses/Lines
NOTICE and Upgrade parts

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Serious POWER:

PROPANE Injection

NITROUS OXIDE (N2O) Injection

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6.5 Gear-Drive
Timing Set
WARNING

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6.5 Pistons, Low Compression, ADVICE

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Headlight Light Switch Saver and Light Intensifier 

Oil Pressure Switch Saver

 Ignition Switch Saver 

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6.5 Stock Airbox

6.5 Stock Exhaust 

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Recommended
  Products for  
  the Duramax  

Duramax 6600 Performance 

Cool Air intake

Power Box

Performance Exhaust

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The Magnus-Moss Warranty Act ______________

GM 2001 HD Silverado / Sierra Power Launch Tour

SEMA 2000 Show LV NV

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SCARAB Offshore Powerboat

1979 Pontiac Limited Special Edition Trans-Am

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Disclaimer

LINKS

Foam Air Filter WARNING

 Paper or plastic?

 Personally if I only had to choose between a regular paper air filter and a foam one I'd choose the paper every time. 

 Fortunately there are OICG (oil-impregnated cotton gauze) air filters that most high-performance applications and even helicopters use, that is my first choice, mainly for the better airflow characteristics.
There have been fit problems with the OICG and foam filters and even some paper filters as to fit on the GM 6.5 and other applications so proper installation and a good sealing filter is key to keeping the dirt out. 

 There are some rumors about higher silicon levels when oil lab tests are made and the rumors blame this on sand passing through the filters, a filter manufacturer says it's from the oil used on the filters having silicon in it, but I have not seen any data to support either claim and it appears to me the silicon level thing is just a scam to sway buyers to other filters. Having run the OICG type filters since 1978 I would know if any sand passed through the filters, and with over 150,000 to 200,000+ miles on many vehicles in that time and various engines disassembled for inspection or modifications and no indications of grit or sand passing through the filters or engines.

Now here is a real WARNING...

If you are considering a foam air filter, here are a few things to think about...

1.  Foam has tiny crevices and those get plugged up easily but are hard to clean so the flow of the filter after cleaning decreases over time as compared to the new filter.
   
2.  Foam is not the best idea for filtration, think about it, what good vehicles or engines use foam filters from the factory?  All that usually comes to mind is lawnmower engines, as an example I have 2 vintage 1980's walk behind self-propelled lawnmowers, both are made by Snapper and feature Briggs & Stratton engines, one is a regular duty 4hp and it has the cheap foam filters that plug up and eventually fall apart, the other machine is a 5hp "commercial" unit and it has a canister paper filter, my point being even lawnmower and small engine manufacturer's know to filter better for long term reliability foam is not the way to go.
   
3.  Did you ever notice that no popular makers of high-performance vehicles, aftermarket performance shops or manufacturers of performance air intakes use the foam filters? in fact I know of none, there is good reason why they don't use them.
   
4.  Foam is really only good as an outer layer if you need added filtration for an extra dusty or extreme conditions, and then the quality performance filter makers may offer foam as an add on outer layer over paper or oil impregnated cotton gauze (OICG) type air filters.
   
5.  Additionally, if a pictures says a thousand words, below is a picture of a lawnmower foam filter after not all that much use and it failed, and let unfiltered air and dirt was pass right in to the engine, worse still the dirtiest and most abrasive deteriorated parts of the filter get sucked in to the engine as well.

Click image to enlarge

  It's not too difficult to imagine the horror you'd feel if a dirty foam filter deteriorated and emptied all the dirty contents, it held for who knows how long, in to your expensive turbocharger and expensive high compression diesel engine. Even if lucky enough not to have it fail completely, just a tear can let a lot of dirt that built up on the filter and other unfiltered air pass. Air like water tends to follow the path of last resistance or least restriction, so the majority of air would enter the hole or tear and rapidly wear away the foam to make a bigger and bigger path, as shown in by the photo below.

Click image to enlarge

 So if someone is trying to sell you a performance air filter, make sure you ask what the media material is, and if it is foam, RUN!

 I would seriously question the credibility and actual experience in the automotive business of anyone recommending one of those foam filters for your turbo diesel engine.

 Fortunately foam filters are not too popular, and for good reason...

  Paper or Plastic? Well foam should be out and paper is OK, but you may want to consider a Hi-Flow oil impregnated cotton gauze (OICG) type air filters, better flow for better breathing that should result in power and mpg gains.

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Pictures of the truck     Performance Data   
  Boost Control    Fuel Control  Transmission Control
  PMD / FSD Remote Harness   PDC: Pump Driver Cooler  
Performance Cool Air Intake  High-Performance EXHAUST System 
Water Injection    PROPANE Injection    NITROUS OXIDE Injection
  Dual Auxiliary Electric Cooling Fans   Hi-Flow Dual Thermostat Cooling Upgrade
Oil Cooler Lines, Hose Upgrades    
Transmission Power Relay System   Headlight Relay and Light Intensifier  
  Fuel Lift Pump Relay System