GM 6.5 Turbo Diesel Performance Tuned Exhaust Systems

High-Performance Exhaust System,
Mufflers & Special Pipes.
Copyright 1994-2009


 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 may want to 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 we felt there was some room for improvement.  On a 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.  

          HIGH PERFORMANCE Exhaust System for GM 6.5 Turbo Diesels, 6.5 Diesel | Copyright 2009 a1customs.com |
 Actual item may vary in appearance or materials due to variations in production and suppliers of materials. Our Performance exhaust systems are notated as for 'off-road' use only as regulations vary between localities.
 Above picture is of our 4.0" High-Performance Tuned Exhaust System, we are the GM 6.5 Diesel Performance Specialists, this system made to our specifications as it is designed specifically for the GM 6.5 Liter Turbo-Diesel applications. The 3.5" system
(not shown) has a smoother 'hump' over the axle but 4.0" require sharper bends due to pipe size and limited space available for proper clearances.  For best flow, all bends are mandrel bent so there are no kinks or wrinkles in the bends.

          HIGH PERFORMANCE Exhaust System SPECIAL OFFSET PIPE for GM 6.5 Turbo Diesels, 6.5 Diesel | Copyright 2009 a1customs.com | Click image to enlarge

 Above picture is of our special offset pipe, that is properly designed to allow clearance around the body and crossmember, other cheaper and lesser quality systems sold by others are typically a generic style and not properly designed for the GM 6.5 turbo diesel engines and do not fit properly. Our systems are specifically designed for the GM 6.5 Turbo Diesel.

 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.

We offer a 3.5"" system good for most 6.5TD trucks and for more powerful applications, where running higher boost, propane injection and/or 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. 

 Here is a view of our High Performance mufflers:
 Actual item may vary in appearance or materials due to variations in production and suppliers of materials.

          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. 

NOTE:
These are High Performance Mufflers

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

          HIGH PERFORMANCE TURBO DIESEL MUFFLERS, Materials; Aluminzed, Stainless Steel and High Polished Stainless. | Copyright 2009 a1customs.com |

          HIGH PERFORMANCE TURBO DIESEL MUFFLERS, Materials; Aluminzed, Stainless Steel and Highly Polished Stainless Steel. | Copyright 2009 a1customs.com | Click image to enlarge
 

          HIGH PERFORMANCE MUFFLERS for TURBO DIESELS, Stainless Steel and Highly Polished Stainless | Copyright 2009 a1customs.com | Click image to enlarge

 Above is a better view of our 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 and even the budget mufflers we offer are of a straight-through design and are long lasting, and are not packed with fiberglass or steel fibers that can breakdown and blow out.

        HIGH PERFORMANCE MUFFLER (inside view) for GM 6.5 Turbo Diesels, 6.5 Diesel, 6.5 Liter, 6.5 Litre. | Copyright 2009 a1customs.com | Click image to enlarge

Muffler louvers as viewed from the inlet side.

        HIGH PERFORMANCE MUFFLER (inside view-2) for GM 6.5 Turbo Diesels, 6.5 Diesel, 6.5 Liter, 6.5 Litre. | Copyright 2009 a1customs.com | Click ABOVE image to see enlarged.

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.  These budget mufflers are good for those who's budget does not suit the Premium High Performance mufflers shown above, the budget muffler is pictured below.

        BUDGET PERFORMANCE MUFFLER for Turbo Diesels | 6.5 Turbo Diesel, 6.5 Liter, 6.5 Litre | Copyright 2009 a1customs.com | Click image to enlarge

 Above is a picture of the "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 $624.95 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 $699.95 add $50 for 4.0" ADD $25 for Extended or Suburban Or ADD $35 Crew Cabs.
 

Pipes are heavy gauge aluminized steel.

       

*all prices on web site are subject to change without notice, always email for accurate price quote and include your full address for proper shipping estimate.
 

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. Our Performance exhaust systems are notated as for 'off-road' use only as regulations vary between localities.

 Email us at; for more info.

 NOTE:  It is Highly Recommended that the PDC/PMD Remote Package and OPS SAVER be added for RELIABILITY to ANY GM 6.5 Liter Electronic Fuel Injected Diesel engines (even STOCK engines) for RELIABILITY, before (or at the same time) as adding ANY power upgrades.

Order Yours NOW !!!
 email  Sales (AT) A1customs.com  for details.


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a1customs.com
587 N. Ventu Park Rd. E28
 Newbury Park, CA 91320

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