Performance Exhaust

GM Diesel Trucks & SUVs 

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Pictures of our 6.5TD truck

Performance Data



Scroll Down for Duramax info & items

  Products for 
  the GM 6.5TD 

6.5 PDC: Pump Driver Cooler

6.5 PMD / FSD Remote Harness


6.5 Dash Mounted Adjustable FUEL Control

Transmission Control 4L80E

All Hi-Flow Air Filters

6.5 TD Performance Cool Air Intake



6.5 TD Turbo Downpipe

Performance EXHAUST Systems


Mist Injection

Fan Clutch


6.5 TD Intercooler

Dual Auxiliary Electric Cooling Fans

6.5 Hi-Flow Dual Thermostat Cooling Upgrade


6.5 Oil Cooler Hoses/Lines
NOTICE and Upgrade parts


Serious POWER:

PROPANE Injection



6.5 Gear-Drive
Timing Set


6.5 Pistons, Low Compression, ADVICE


Headlight Light Switch Saver and Light Intensifier 

Oil Pressure Switch Saver

 Ignition Switch Saver 


6.5 Stock Airbox

6.5 Stock Exhaust 


  Products for  
  the Duramax  

Duramax 6600 Performance 

Cool Air intake

Power Box

Performance Exhaust


The Magnus-Moss Warranty Act ______________

GM 2001 HD Silverado / Sierra Power Launch Tour

SEMA 2000 Show LV NV


SCARAB Offshore Powerboat

1979 Pontiac Limited Special Edition Trans-Am




Performance Exhaust

 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. 

 Email me at,
for more info.

Here is a view of our High Performance mufflers:

mufflers_350vs400-IAEI.jpg (120045 bytes)
Click image to enlarge

3.5" ID versus 4.0" ID, Note
the 3.5" Muffler shown is the premium 24" long bodied (30"
overall) muffler in Stainless Steel. 

These are High Performance Mufflers

mufflers_materials-IAEI.jpg (138505 bytes)
Click image to enlarge

4.0" inlet/outlet High Performance
mufflers, from left to right, Aluminized, Stainless Steel and High Polished
Stainless Steel.  Note the high quality of the welds.

mufflers_materials-2-IAEI.jpg (91459 bytes)
Click image to enlarge

Muffler_SS_vs_SP-IAEI.jpg (206305 bytes) 
Click image to enlarge

Here is a better view of the Stainless
Steel High Performance Mufflers, the one on the right is highly polished to a
mirror like finish.   You can see the length here.

These Premium
High Performance Mufflers are and straight-through design and are not
packed with fiberglass or steel fibers that can breakdown and blow out.

muffler inside-IAEI.jpg (116898 bytes)
Click image to enlarge

Muffler louvers as viewed from the inlet

muffler_inside-louvers-IAEI.jpg (173479 bytes)
Click image to enlarge

Muffler louvers, these are designed to be
installed facing the rear (outlet side), as view from the outlet side.


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.

muffler_budget-IAEI.jpg (61390 bytes)
Click image to enlarge

"BUDGET" Muffler. Note that it
is shorter than the premium mufflers.

Exhaust Pricing.

Our 6.5TD Exhaust Systems are from "turbo-back", starting with and including the turbo downpipe, offset pipe, center pipe, muffler and tailpipe.
Note: Catalytic converter (soot trap) not included, kits have just pipe there.

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.

 Email me at,
for more info.


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 

Downpipe   Converter Test-Pipe 
Stock Exhaust  Stock Airbox

GM 2001 HD Silverado / Sierra Power Launch   SEMA 2000 Show, Las Vegas, NV 
SCARAB Offshore Powerboat    1979 Pontiac Limited Special Edition Trans-Am LINKS    


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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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Copyright 2000 IAEI
Last modified: June 01, 2002