S&S CYCLE Grand National Slip-On Mufflers - Chrome 550-0757B Automotive/UTV Tires - On Road Designed for high performance engines

Designed for high performance engines with cylinder bores 4

2x Ring packs which includes the top

'73-80 models may require drilling

High Compression Piston Kit - +0

The cylinder heads on this engine is specially machined to compensate for the non-stock cylinder length

S&S CYCLE Grand National Slip-On Mufflers - Chrome 550-0757B Automotive/UTV Tires - On Road Designed for high performance enginesGrand National Slip On Mufflers Chrome Improved horsepower and torque (when used with a Stealth Air cleaner kit; sold separately), Race inspired design, Removable dB reducer for back pressure and sound tuning, Meet J2825 levels for sound, All hardware included, Deep performance rumble replaces stock whisper tone, No mapping required, Sold in pairs, Made in the U. S. A.