Horsepower Inc (HPI)

HPi Performance Exhausts - Milwaukee 8 Bagger - Full Stainless

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

HPi Performance Exhausts - Milwaukee 8 Bagger - Shorty Stainless

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

HPi Performance Exhausts - 99-06 Touring HPi X CBear Stainless

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

HPi Performance Exhausts - M8 Softail Stainless

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

HPi Performance Exhausts - Bagger Twin Cam 09-16 - Full Stainless

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

HPi Performance Exhausts - Bagger Twin Cam 09-16 - Shorty Stainless

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

HPi Performance Exhausts - HPiXSDC Stainless FXR

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

HPi Performance Exhausts - Stainless System for Dyna '06+

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

HPi Performance Exhausts - HPiXSDC Stainless Dyna '01-'05

Horse Power Inc. EXHAUSTS HPi Performance Exhausts are 100% handmade in-house, in the USA, TIG welded, and feature a perforated stainless muffler interior.  Exhausts are available in...

Horsepower, Inc HPI-58D6-18B - Throttle Body - Black - 58/1.80

Completely replaces OEM throttle body and manifold; fully compatible with OEM components Specifically designed for larger cubic inch motors that require substantial airflow Equipped with a sealed...

Horsepower, Inc HPI-58D6-76B - Throttle Body - Black - 58/1.76

Completely replaces OEM throttle body and manifold; fully compatible with OEM components Specifically designed for larger cubic inch motors that require substantial airflow Equipped with a sealed...

Horsepower, Inc HPI-55D6-16B - Throttle Body - Black - 55mm/1.66

Includes throttle body, CNC ported intake manifold, throttle cable bracket, intake flanges and seals Flow bench-tested and dyno-proven to deliver increased airflow, horsepower and torque Brass...

Horsepower, Inc HPI-51D6-16B - Throttle Body - Black - 51mm/1.66

Includes throttle body, CNC ported intake manifold, throttle cable bracket, intake flanges and seals Flow bench-tested and dyno-proven to deliver increased airflow, horsepower and torque Brass...

Horsepower, Inc HPI-55D6-18B - Throttle Body - Black - 55mm/1.80

Includes throttle body, CNC ported intake manifold, throttle cable bracket, intake flanges and seals Flow bench-tested and dyno-proven to deliver increased airflow, horsepower and torque Brass...

Horsepower, INC #HPI-58D1-18B - Max Flow™ Throttle Body - Black - Twin Cam - 58 mm

Max Flow™ Throttle Body - Black - Twin Cam - 58 mmFeaturesCompletely replaces OEM throttle body and manifold; fully compatible with OEM componentsSpecifically designed for larger cubic inch motors...

Horsepower, INC #HPI-58D1-76B - Max Flow™ Throttle Body - Black - Twin Cam - 58 mm

Max Flow™ Throttle Body - Black - Twin Cam - 58 mmFeaturesCompletely replaces OEM throttle body and manifold; fully compatible with OEM componentsSpecifically designed for larger cubic inch motors...

Horsepower, INC #HPI-55D1-16B - Big Bore Throttle Body - Black - 55 mm - Twin Cam

Big Bore Throttle Body - Black - 55 mm - Twin CamFeaturesIncludes throttle body, CNC ported intake manifold, throttle cable bracket, intake flanges and sealsFlow bench-tested and dyno-proven to...

Horsepower, INC #HPI-51D1-16B - Big Bore Throttle Body - Black - 51 mm - Twin Cam

Big Bore Throttle Body - Black - 51 mm - Twin CamFeaturesIncludes throttle body, CNC ported intake manifold, throttle cable bracket, intake flanges and sealsFlow bench-tested and dyno-proven to...

Horsepower, INC #HPI-55MF1-18B - Max Flow™ Throttle Body - Black - Twin Cam - 55 mm

Max Flow™ Throttle Body - Black - Twin Cam - 55 mmFeaturesCompletely replaces OEM throttle body and manifold; fully compatible with OEM componentsSpecifically designed for larger cubic inch motors...

Horsepower, INC #HPI-51D6-17B - Big Bore Throttle Body - Black - 51 mm - Twin Cam

Big Bore Throttle Body - Black - 51 mm - Twin CamFeaturesIncludes throttle body, CNC ported intake manifold, throttle cable bracket, intake flanges and sealsFlow bench-tested and dyno-proven to...

Horsepower, INC #HPI-55D1-18B - Big Bore Throttle Body - Black - 55 mm - Twin Cam

Big Bore Throttle Body - Black - 55 mm - Twin CamFeaturesIncludes throttle body, CNC ported intake manifold, throttle cable bracket, intake flanges and sealsFlow bench-tested and dyno-proven to...

Horsepower, INC #HPI-51D1-17B - Big Bore Throttle Body - Black - 51 mm - Twin Cam

Big Bore Throttle Body - Black - 51 mm - Twin CamFeaturesIncludes throttle body, CNC ported intake manifold, throttle cable bracket, intake flanges and sealsFlow bench-tested and dyno-proven to...

Horsepower, INC #HPI-D1NJ-1 - Fuel Injectors - 6.2 gm/sec

Fuel Injectors - 6.2 gm/secFeaturesRecommended for "Big Inch" engines with large plenums (120 hp or greater)43% increase in flow over stock injectorsMade in the...

Horsepower, INC #HPI-IF-6E - Intake Flange Set - '01-'05 Big Twin

Intake Flange Set - '01-'05 Big TwinFeaturesCNC-machined 6061 billet aluminum constructionWill not crack or warp like some forged flangesMade in the USASpecsFeaturesIncludes SealsMaterial6061 Billet...