American Racing: 2011-2018 MUSTANG SHELBY GT500 LONG SYSTEM: 1 7/8" x 3" or 2" x 3" HEADERS piece Whether you're tracking your performance

Whether you're tracking your performance machine or keeping up on the regular maintenance

Exhaust port volume: 106 cc (peak stock flow 194 cfm)

A Kooks Off-Road Down Pipe eliminates those power robbing factory catalytic converters to release all the hidden power of your S550 Mustang has to offer

Up to 400 HP

and a unique Silver Leopard finish

American Racing: 2011-2018 MUSTANG SHELBY GT500 LONG SYSTEM: 1 7/8" x 3" or 2" x 3" HEADERS piece Whether you're tracking your performanceAmerican Racing Headers: 2011 2018 MUSTANG SHELBY GT500 LONG SYSTEM: 1 7 8" x 3" or 2" x 3" ARH rules the roost with GT500 systems up to 2 and your choice of X Pipe or H Pipe to tailor the sound to your specific needs also available. Product features on ALL American Racing Headers systems include: 100% Made in the USA Never Outsourced Made entirely of 304 stainless steel 3 8" thick laser cut flanges for a warp free seal Hand ported TIG welded inlets