Doug Thorley Diesel Cat-Back Exhaust System

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Features

  • The Doug Thorley Diesel Exhaust System juices-up Powerstroke, Duramax and Cummins diesel trucks with free-flowing power
  • Utilizes custom CNC mandrel-bent 16-gauge aluminized steel tubing to eliminate restrictions and backpressure
  • Doug Thorley Diesel Exhausts boast a massive 4" pipe diameter to accommodate high-displacement diesel engines
  • Bolts directly to stock mounting positions at the turbo or catalytic converter without any modifications required
  • Doug Thorley Headers' Diesel Exhaust Systems employ factory-style hangers for straightforward mounting
  • Exit pipes are capped-off by a whopping 5" chrome exhaust tip
  • Includes a high-performance Thorley muffler
  • Your Doug Thorley Diesel Exhaust carries a Lifetime Warranty for the original owner

Description

Your diesel rig came with more than enough horsepower and torque for the average driver. Doug Thorley Exhausts have never been much for average, though. Their decades-long mission has been to make stock exhausts look inferior.

This is where Doug Thorley Headers’ Diesel Exhaust comes in for your truck. Using 16-gauge aluminized steel tubing in a girthy 4” diameter, custom CNC mandrel bending and a free-flowing muffler, a Thorley Diesel Exhaust adds instant punch at the pedal. It provides loads of low-end pulling torque, too.

Doug Thorley Diesel Exhausts keep installation simple. All diesel exhausts mount to the original positions, and include factory-style hangers for straightforward mounting. Plus, each Doug Thorley Diesel Exhaust stays 50-state smog legal.

To top it all off, your Doug Thorley Diesel Exhaust is capped by a burly 5” diameter chrome exhaust tip and carries a Lifetime Warranty for the original owner—hardly an average deal on diesel exhaust.

Doug Thorley Diesel Cat-Back Exhaust System Customer Reviews

Average Customer Rating

   (16)
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nice system easy install,,well made, fast delivery

Posted on 09/11/2009 by Cynthia J. R. - 1997 Dodge Ram (New Britain,CT)

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Price/Value
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"nice system easy install,,well made, fast delivery"

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About Cynthia J. R.
Vehicle
1997 Dodge Ram
I use my vehicle for
commuting, hunting, fishing, travel, family activities, etc...)
 
99 dodge cummins

Posted on 10/22/2007 by Rick L G. - 1999 Dodge Ram (Harrison,AR)

2 of 2 people found the following review helpful.

"I ordered the Doug Thorley turbo back 4 in. exhaust, but it was back orderd twice from the factory which was 4 week delay. I recieved instead was the Jardine exhaust . I,m happy with it . Seems to be a Quality product. Installation was real smooth and all the OEM hangers fit good. Has a real nice chrome tip and has a real nice throaty sound. It took me less then 3 hr. to cut off old and install the new exhaust in my driveway by myself. I beleive it was a good purchase and worth waiting for."

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About Rick L G.
Vehicle
1999 Dodge Ram
I use my vehicle for
commuting and have 2 goose neck trailers,1 with living quarters to haul 2-3 horses
 
Easy Installation

Posted on 04/18/2007 by Jeremy H. - 2004 Chevy Silverado (Mcveytown,PA)

1 of 2 people found the following review helpful.

"The kit was very easy to install. I am happy with the sound!"

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About Jeremy H.
Vehicle
2004 Chevy Silverado
I use my vehicle for
commuting and hauling
 
OK

Posted on 04/13/2007 by James M. - 2006 Chevy Kodiak (Carbondale,KS)

1 of 2 people found the following review helpful.

"I ordered the Doug Thorley exhast, but the jardine exhaust was what I got. the picture was bolt up but this system was cut and weld. It did go on and seems to fit."

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About James M.
Vehicle
2006 Chevy Kodiak
I use my vehicle for
RV pulling and pulling a 32 ft stock trailer
 
Excellent

Posted on 04/06/2007 by Randall H. - 2002 Ford F250 (Montague,MI)

0 of 1 people found the following review helpful.

"System was VERY easy to install. I suggest using a sawsall to remove the stock system in three pieces. I removed the stock, installed and welded the new, in 1 1/2 hours! Excellent system, sounds AWESOME! Really brought the 7.3 to life!"

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About Randall H.
Vehicle
2002 Ford F250
I use my vehicle for
EVERYTHING
 
doug thorley diesel exhaust

Posted on 04/04/2007 by John B. - 1996 Ford F-350 (Mount Morris,MI)

"for money, the best value diesel performance system available. as good as systems costing twice as much."

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About John B.
Vehicle
1996 Ford F-350
I use my vehicle for
pulling a wedge three car trailer.
 
Great System

Posted on 03/10/2007 by James S. - 2001 Dodge Ram (Grand Bay,AL)

"The system sounds just great, can't keep my foot out of it enough to tell if it has helped my fuel mileage. The truck seems to have more power, I haven't towed a large enough load yet to really evaluate the pwer part of it. Being an old school hot rodder, I'd buy it again just to be able to listen to the pwerfull sound of it, I really enjoy it. Thanks"

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About James S.
Vehicle
2001 Dodge Ram
I use my vehicle for
commercial, Hot Shot pulling a 40' trailer.
 
Wasnt so simple. But worth it.

Posted on 01/31/2007 by Alex M. - 2002 Ford Excursion (Carthage,MO)

"Well the shipping came in on time as promised. Everything was there, no missing parts. I have basic knowledge of mechanics but the instructions were not very clear at all. I have a 2002 Excursion Limited Diesel, I would have to say that the biggest problems with this were getting the rubber hangers of, and the down pipe would not come out at all. It will have to be hacksawed or you will have to remove the peice holding the transmission up to provide enough clearance of the downpipe removal. Also you will need to have a high jack or the cat back will not have enough clearance to be removed, but it can be hacksawed. All in all, if you can manage the removal of the old muffler, putting the new one will be much much easier. I hope this helps."

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About Alex M.
Vehicle
2002 Ford Excursion
I use my vehicle for
School, commuting, travel
 
Powerstroke

Posted on 01/14/2007 by Courtney D. - 2006 Ford F250 (Fort Mill,SC)

3 of 4 people found the following review helpful.

"Great sounding diesel exhaust nice and throaty without being too load. Easy to install hardest part is getting the old system out."

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About Courtney D.
Vehicle
2006 Ford F250
I use my vehicle for
daily driver and pulling 16ft enclosed trailer
 
great sound

Posted on 10/15/2006 by Heath P. - 2006 Ford F-250 (Mesa,AZ)

"I was leary about getting a cat-back system, but w/ the new emissions in 2007 I had to keep the cat on. The system is very easy to install. The hardest part is getting the old system out. It's not too loud but gets you noticed. I only wish the tip was longer, it looks kind of funny with big exhaust and this short tip. Overall very satisfied with my purchase. The truck runs great and sounds great now. I did get better response with it also."

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About Heath P.
Vehicle
2006 Ford F-250
I use my vehicle for
work,play,family fun
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