harley 4dCUSTOM PIPES INC (located in Houston, TX). Reginald loves the thrill of two wheels and is the master-mind behind manufacturing new innovating ideas for motor cycle exhaust systems. After purchasing a Harley-Davison softail bike,TECHNICAL SPECIFICATIONS. 1200.4D 2Ω Power @ 12.6V @ 1Ω: 4 x 300 W RMS Power @ 12.6V @ 2Ω: 4 x 165 W RMS Power @ 12.6V @ 4Ω: 4 x 91 W RMS Bridge Power @ 12.6V @