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PERFORMANCE OPTIONS
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ACCESSORIE OPTIONS
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AIR AND INTAKE OPTIONS
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COMPUTER OPTIONS
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 DYNO TUNED POWER OPTIONS™
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ENGINE POWER OPTIONS
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EXHAUST OPTIONS
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FUEL/INJECTOR/FUEL RAIL OPTIONS
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GAUGES / A-PILLAR / POD / OPTIONS
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IGNITION OPTIONS
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NITROUS OXIDE OPTIONS
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PULLEY (underdrive) OPTIONS
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SUPERCHARGER OPTIONS
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SUSPENSION OPTIONS
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TRANSMISSION/SHIFTER OPTIONS
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TRACTION OPTIONS
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| DYNO PROVEN TO PROVIDE THE LARGEST HORSEPOWER GAINS FOR 99-08 (classic) GMC/CHEVROLET TRUCK-SUV
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 STRATEGY
In keeping with our goal of providing our customers with the best possible value, we have tested a large group of components specifically designed for GM Trucks And SUV's .
We have invested many hours evaluating and refining each of the listed performance products on our MD Chassis DYNO, to ensure that we could develop as much power as possible, as safely as possible.
The site menu on the left side of this page, lists the clear winners when it comes to “performance vs. dollar” value, and increased fuel economy. Please check back often as we are always developing new ways to create more horsepower and economy.
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THE NEW MOTOBLUE™ GEN X UnderDrive Pulley Kit
Harmonic Balancer/UnderDrive Pulley, 99-07 Truck SUV 4.8/5.3/6.0L V8
What's an underdrive pulley?
An underdrive pulley is a replacement pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM decreases.
 Under drive pulleys do not add power to the engine, they free up the power that is normally wasted on overdriven accessories. The theory is that a larger pulley will drive the accessories slower thus reducing their parasitic horsepower loss.
No more power total, but more power sent to the wheels. As an additional benefit, the reduction in wear (less usage) on the accessories due to the lower duty cycles can extend the life of these parts.
For example, the alternator, power steering, water pump and air compressor rob horsepower from
the engine. By replacing factory-sized crank balancer/pulley and water pump drive pulley with a resized pulleys,
the accessories are slowed, resulting in more horsepower available to the drive wheels.
MOTOBLUE™ H.O. Series pulleys will increase horsepower up to 16 RWHP, and increase mileage by 1 to 2 MPG. MOTOBLUE H.O Pulleys
are manufactured from billet steel, exceeding factory quality and are the only Pulley system available on the market today that are SFI approved for all racing applications.
When purchasing the MOTOBLUE™ UnderDrive crank pulley, there are two options for alternator pulley selection:
Stock Alternator Pulley - Most commonly used.
Suitable for most applications.
Overdrive Alternator Pulley - Recommended for automatic cars to help bring alternator speeds back to near stock levels without sacrificing
too much horsepower. Extremely important for vehicles with high accessory drag such as cars with lots of stereo modifications.
| Alt Pulley |
Pulley Part # |
AC Belt # |
Access. Belt # |
| Overdrive | MTB602331 |
11-378K4 | 11-755K6 |
| Stock | - |
11-378K4 | 11-760K6 |
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| Harmonic Balancer/UnderDrive Pulley, 99-07 Truck SUV 4.8/5.3/6.0L (V8) |
| Part # |
Year |
Product |
Price |
| MTB602333 |
99-09
4.8L, V8
5.3L, V8
6.0L, V8 |
MOTOBLUE™ GEN X UnderDrive Harmonic Balancer - 25% underdrive SFI approved balancer pulley (only)
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$ 229.99 |
| MTB602334 |
99-09
4.8L, V8
5.3L, V8
6.0L, V8 |
MOTOBLUE™ GEN X UnderDrive Harmonic Balancer - 25% underdrive SFI approved balancer pulley w/Overdrive Alternator kit
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$ 259.99 |
| MTB602331 |
97-06
LS1/LS2 |
32% Overdrive Alternator Pulley- 1 ¾ dia. Overdrive pulley (nitride-black)
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$ 39.99 |
| GDY11-378K4 |
97-06
LS1/LS2 |
Air Conditioning (A/C) Belt - For MOTOBLUE™ 25% Underdrive Harmonic Balancer Pulley Kit
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$ 39.99 |
| GDY11-755K6 |
97-06
LS1/LS2 |
Accessory Belt - For MOTOBLUE™ Overdrive Alternator Pulley
- With MOTOBLUE™ 25% Underdrive Harmonic Balancer Pulley Kit
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$ 39.99 |
| GDY11-760K6 |
97-06
LS1/LS2 |
Accessory Belt - For Stock Alternator Pulley
- With MOTOBLUE™ 25% Underdrive Harmonic Balancer Pulley (only)
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$ 39.99 |
Tech Note: Use of Harmonic Balancer Puller tool required for factory Harmonic Balancer removal.
Click-On Price to Order
32% Overdrive Alternator Pulley
Nitride Overdrive Alternator Pulley
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Increase your vehicles charging capacity, when installing any under drive pulley we recommend replacing the alternator pulley with our 32% overdrive pulley. This guarantees proper charging at any RPM.
For Serpentine Belt Systems
- 32% Overdrive Alternator Pulley
- Increased Charging Capacity
- CNC -Machined Billet Steel Nitride Coated
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| Part # |
Year |
Application |
Description |
Price |
| MTB602331 |
95-09 |
All Engines |
32% Overdrive Alternator Pulley- 1 ¾ dia. Overdrive pulley (nitride-black)
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$ 39.99 |
Click-On Price to Order
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Chrome Accessorie Kits
Synthetic Motor Oil / Gear Fluids 
160º/180º LOW TEMP T/Stats
S&B Performance Intake Kit (14+ hp)
FIPK® Cold-Air (12+ hp)
Filters
PREDATOR Flash Tuner 
FAST-FLASH™ Power Programmer 
X2 Custom Flash Tuners
DeltaForce I-2 Power Programmers 
CORTEX Flash Programmer
Xtreme Cam/Spring Kits (61+ hp)
STAGE II/III Cyl. Heads
Stainless Headers (C.A.R.B. Legal)
Performance Exhaust Kits
T-304 Stainless Cat-back™ Kits 
High-Flow Catalytic Converters
POWERFLOW EFI Fuel Rails 
GaugeWorks Pillars and Pods 
2 1/16 inch dia. Gauges
BLASTER Coils LS-1/LS-6
Copper / Iridium Spark Plugs 
V8 Performance Spark Plug Kits
™ Nitrous Oxide Systems (35-175 hp)
Boost Coolers 
Rear Lowering Shackles 1½ to 2.0 
Maximizer™ / Streetfighter Converters
LAKEWOOD Bolt-on Traction Bars
Drag Radials / Drag Slicks