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Now - December 31st


SAVE $250 ON PDI BIG BOSS TUNER



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BULLY DOG BIG RIG HOLIDAY REBATES!



December 4th - December 31st

$250 Rebate on HDGT (46500)
$100 Rebates on ECM Tuners (46511, 46521, 46531)
$150 Rebates on CAT Turbos (56700, 56800, 56845)
$65 Rebate on Detroit Turbo (56900)



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SCT HOLIDAY REBATES!



December 4th - December 31st

$40 Rebate on BDX (40490)
$40 Rebates on X4 Tuners (7015, 7416)
$40 Rebates on LiveWire TS+ (5015P)



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BULLY DOG HOLIDAY REBATES!



December 4th - December 31st

$40 Rebate on BDX (40470)
$40 Rebates on GT Diesel & GT Gas (40420, 40417)



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FREE SHIPPING ON ORDERS OVER $100!







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PARLEYS DIESEL PERFORMANCE PARTS

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Top sellers

Bully Dog GT Tuner & Monitor


From: $348.95
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SCT X4 Tuner


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Andersen Ultimate 5th Wheel Hitch


From: $804.99


PDI Big Boss Tuner


From: $2,199.00


Bully Dog Big Rig Turbos


From: $998.00


S&B Cold Air Intakes


From: $349.00


FASS Titanium Signature Series Diesel Li


From: $699.00


AirDog II-5G Lift Pumps


From: $825.00


Ag Diesel Solutions Performance Modules


From: $415.55


B&W Turnoverball Hitch


From: $549.00


Parley's Blog

Latest News

328

Save $250 on a PDI Big Boss Tuner

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December 6, 2023

3 weeks ago

240

Get a free Carhartt Jacket with the purc

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December 6, 2023

3 weeks ago

301

December 2023 Rebate Program for Bully D

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December 4, 2023

3 weeks ago

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Reviews

Satisfied Customers


2006 PETE WITH ACERT CAT 550

Verified Purchaser

Verified Purchase



I have a ‘06 Pete with a 550 Acert Dual Turbo Cat. I purchased my truck new and
added a heavy haul package shortly after purchasing the truck. My fuel economy
with this heavy haul packages was between 5.6 to 5.7 MPG. With the Bully Dog set
on the economy with power tune I’m up to 6.0 MPG so I’ve picked up .3 to .4
tenths in fuel economy. I pull a 3 axle end-dump on a steady run hauling lime
sludge that is a waste product from the oil that is pulled out of the ground. So
I’m running loaded with maximum weight one way and empty coming back. With the
tune installed I’m very happy with the power increases. With the heavy haul
package on my truck it pulled pretty good, but it pulls even better with the ECM
Tuner installed. There are some pretty good grades on my run, including one that
is a 6% grade that is a kilometer and a half long. Before I would top it at 80
kilometers and with the Bully Dog I now top it at 90 kilometers per hour so ...

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CUMMINS ISX POWER BOOST

Verified Purchaser

Verified Purchase



I’m really pleased with the way it’s doing. I didn’t talk to anyone else before
because I wanted to do my own checking. With the economy with power loaded I
have seen no change in any of the temps on the truck. What I have noticed is
hauling 81,000 lbs climbing a 6% grade I usually get to the top lugging at 31
MPH and now I’m climbing the same grade at 41 MPH. When you are running and
pulling it feels like the truck is running easier and doing the job better.
Anybody that I talk to is going to get nothing but a positive attitude from me
about it. I like the way my truck runs and I’m real pleased the product. Thank
you.


WE LOVE THE POWER AND ECONOMICAL FUEL MILEAGE

Verified Purchaser

Verified Purchase



We would like you to know that we think the BullyDog Big Rig is a very good
product. Our truck that we have is 2 years old. The first year we were lucky to
get 4.5 to 5.0 miles to the gallon, and our power would not let us climb any
hill at more than 35 MPH, let alone a mountain. Our average weight is 100k to
120k. We were told about BullyDog Big Rig, and so what did we have to lose. Now
we get from 4.75 to 7.0 miles to the gallon. We average 6.3 miles to the gallon
and the power … Wow!… We came up the mountain in Tennessee at Rockwood and we
topped that mountain at 65 MPH. We love the power and we recommend if you need
the power and economical fuel mileage try the Bullydog semi tuners. We are very
happy with ours. We are leased and haul heavy all the time.


C-15 RUNS LIKE THE OLD MECHANICAL ENGINES NOW

Verified Purchaser

Verified Purchase



I’m hauling coal pulling heavy loads up long grades running a consistent daily
route. We installed the Heavy Duty Gauge Tuner over 6 months ago on my C-15. I
like how the truck runs with the economy with power tune installed. It’s a
completely different motor with the tune installed. You have a lot more throttle
response and the engine seems to run a lot more like the old mechanical motors.
I like it. It has brought up the fuel economy 4/10s. It is working well.


5.9L CUMMINS RV PERFORMANCE UPGRADE

Verified Purchaser

Verified Purchase



Hello, I purchased the Ag Diesel Solutions 12300 performance module from Parleys
Diesel and just installed it on my 2001 Newmar motorhome’s Cummins ISB 5.9-260
VP44; the results have dramatically exceeded my expectations. I was looking for
improved on-ramp power/acceleration as well as better performance (less slow
down) on grades. I got both and then some! The motorhome now drives like a big
diesel SUV: fast off the line and actually accelerates up medium grades. Better
fuel economy would be icing on the cake. Thanks to Parleys and ADS for such a
superb solution!

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