GM Diesel Trucks & SUVs
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Transmission Control 4L80E
6.5 TD Performance Cool Air Intake
6.5 TD Turbo Downpipe
6.5 TD Intercooler
Headlight Light Switch Saver and Light Intensifier
Oil Pressure Switch Saver
Ignition Switch Saver
6.5 Stock Airbox
6.5 Stock Exhaust
Duramax 6600 Performance
The Magnus-Moss Warranty Act ______________
The 6.5 stock exhaust system can be improved dramatically by removing the catalytic converter or "soot trap" and in some cases the factory turbo downpipe is dented or crushed looking and very restrictive. You should check local regulations before removing the cat. conv. but being a diesel in some areas this 'may' be allowed.
There are a few aftermarket systems available for the 6.5 Turbo Diesel, and most are OK. But I felt there was some room for improvement. On a bone stock truck the stock 2-3/4" to 3" pipes will work OK once the cat. conv. and downpipe are restrictions are removed, the muffler is the next biggest restriction.
For engines with added boost or those planning to add power or more boost, I recommend a hi-flow air filter like a "oil impregnated cotton gauze" type and a bigger exhaust of at least 3.5"" with a good performance muffler. When adding propane injection or nitrous oxide injection you will be at power levels flowing large amounts of air and need to have a free flowing exhaust, for those a 4.0"" system with a hi-flowing performance muffler would be better.
I've been asked many times to come up with a system and have worked long and hard on our design. We offer a 3.5"" system good for most 6.5TD trucks and for more powerful applications (such as my truck) where I run high boost, propane injection and nitrous oxide injection, we offer a 4.0"" system.
The aluminized systems are available and are competitively priced, maybe a bit more due to the muffler, but that's the key ingredient.
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Here is a view of our High Performance mufflers:
3.5" ID versus 4.0" ID, Note
4.0" inlet/outlet High Performance
Here is a better view of the Stainless
Muffler louvers as viewed from the inlet
Muffler louvers, these are designed to be
We know sometimes a premium high-performance system is not within the budget so we do offer the construction equipment muffler of which is the same one that has been sold by one reseller and touted as "performance", but we aptly call it our "BUDGET performance" muffler. It will increase power and flow over the stock unit but is smaller in size and we only offer it in 3.5" ID, this is a shorter muffler and a bit noisier the quality is not as good and it is only available in aluminized. This is good for those on a budget and cannot afford the Premium High Performance mufflers shown above.
"BUDGET" Muffler. Note that it
Our 6.5TD Exhaust Systems are from "turbo-back", starting with and including the turbo downpipe, offset pipe, center pipe, muffler and tailpipe.
All downpipes for the GM 6.5TD are 3.0" and mandrel bent, no larger downpipe will fit, and then further back the pipes step up in size. Changing from the restrictive factory downpipe considerably reduces backpressure, and help lower EGTs (exhaust gas temps) and helps the turbo spool up faster. Then further back we step up in size for better flow. On the 4.0" systems it steps up to 3.5" and then to 4.0", the muffler is 4.0" inlet/outlet.
The "Budget-Performance" 3.5" system is $479.95 and is aluminized, includes 3.0" turbo downpipe, offset pipe, center pipe and tailpipe. ADD $25 for Extended or Suburban Or ADD $35 for Crew Cabs.
3.5" 'High-Performance' system with aluminized muffler $524.95 add $50 for 4.0" ADD $25 for Extended or Suburban Or ADD $35 for Crew Cabs.
3.5" 'High-Performance' system with stainless steel muffler $549.95 add $50 for 4.0" ADD $25 for Extended or Suburban Or ADD $35 for Crew Cabs.
3.5" 'High-Performance' system with POLISHED stainless steel muffler $639.95 add $60 for 4.0" ADD $25 for Extended or Suburban Or ADD $35 Crew Cabs.
Pipes are heavy gauge aluminzed steel.
To get the most from the exhaust and the 6.5, I do recommend our Boost & Fuel Controls along with our Hi-Flow Air Filter.
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of the truck
Downpipe Converter Test-Pipe
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Disclaimer: Some products can adjust and/or increase power levels beyond factory parameters, so their use could possibly void your warranty, and may not be legal for use on emission controlled vehicles in some areas, due to these facts buyer accepts all responsibility for use, and his/her actions, there is no warranty either expressed or implied as to use of products, improper installation, settings and/or use of such could possibly cause property damage and or personal injury. The Magnus-Moss Warranty Act prohibits a dealer or manufacturer from voiding your warranty unless a product is directly responsible for a failure. Although effort has been made to try to present accurate information this website, it can contain some opinion, conjecture, errors, mistakes and typos so use any information with that in mind and if in doubt research anything you do not understand or question. There is no guarantee or warranty on information on this website or any others it links to and visitors agree to hold authors, page owners internet service providers and web hosts free from any liability arising from use of information provided. Prices subject to change without notice.
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