whats the difference between these two kits besides the $320 price difference, and why does one require a RACE tuning what exactly is that? thanks
SINISTER DIESEL EGR DELETE KIT WITH INTAKE ELBOW (LBZ)
$549.00
Note: RACE Tuning is Required
SINISTER DIESEL EGR DELETE KIT (LBZ)
$229.00
SINISTER DIESEL EGR DELETE KIT WITH INTAKE ELBOW (LBZ)
$549.00
Note: RACE Tuning is Required
SINISTER DIESEL EGR DELETE KIT (LBZ)
$229.00