These 4” diameter disc-based megaphone series are our signature muffler and provide 8-10% horsepower gains.

The classic megaphone design allows the exhaust gas to expand which increases power while the discs let you control just how much flow you want. Optional open end caps for closed course competition are also available.

Available as slip-ons, 2:1, 2:2 and 2:2 XR Style systems – the 2:2 XR Style system provides a bolt-on 20% horsepower gain.

Twelve - 4” discs are included with slip-ons and the 2:1. Twenty-four - 4” discs are included with the 2:2 systems – that’s 12 discs per muffler.

Add 4” discs to increase horsepower, exhaust tone and flow. Remove 4” discs to reduce sound and increase low-end-torque.

Universal Megaphones for Unique Applications

4" Tunable Disc Accessories

Trapp Caps

Click here to read the 2:2 XR Style Race System article in IronWorks Magazine.

Megaphone Series Videos



Click any Model # for more details.

DESCRIPTION: MODEL# MSRP
2:1 HD XLH 883-1200 86-99 Satin SS 825-70883 $569.00
2:1 HD XLH883-1200 86-99 Polished SS 826-70884 $649.00
2:1 SYST:H-D FLS/FXS '86-06, CHROME HIGH 828-71347 $649.00
2:1 SYST:H-D FXR '84-94, CHROME LOW 828-71355 $649.00
2:1 SYST:H-D SHOVELHEAD '71-84, CHROME 828-77470 $769.00
2:2 RACE SYST H-D XLH883-1200 '04-11, SS 815-71202 $859.00
2:2 Race Syst H-D XLH883-1200 86-99 SS 815-70883 $859.00
2:2 RACE SYST H-D XR1200 '08-11 815-71210 $985.00
2:2 SYST:H-D FXR '84-94, CHROME LOW 828-71335 $898.00
2:2 SYST:H-D FXST '86-06, CHROME LOW 828-71331 $779.00
SLIP-ONS:H-D FLH/FLT'95-11,CHR SLASH MEG 728-78054 $619.00
SLIP-ONS:H-D FLH/FLT'95-11,CHROME MEG 728-78053 $619.00
SS SYST:H-D FLS/FXS '86-06, 2:1 POL H 826-71347 $759.00
SS SYST:H-D FLS/FXS '86-06, 2:1 POL LOW 826-71343 $699.00
SS SYST:H-D FLS/FXS '86-95, 2:1 SATIN H 825-71346 $599.00
SS SYST:H-D FXD '91-05 ,2:1 SATIN 825-71358 $599.00
SS SYST:H-D FXD '91-05, 2:1 POLISHED 826-71359 $689.00
SS SYST:H-D FXR '84-94, 2:1 POLISH HIGH 826-71357 $759.00
SS SYST:H-D FXR '84-94, 2:1 POLISHED 826-71355 $759.00
SS SYST:H-D FXR '84-94, 2:1 SATIN HIGH 825-71356 $619.00
SS SYST:H-D FXST '86-06, 2:2 POL LOW 826-71331 $749.00
SS SYST:H-D SHOVELHEAD '71-84,2:1 POLISH 826-77470 $759.00

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