More on cylinder head sealing here

especially during the first few miles after installation

11-12-7-557-265

use an ARP chaser to chase the threads

BMW E9X M3 S65 Complete Exhaust System Dimensions:1.75" x 3" More on cylinder head sealingBMW E9X M3 S65 Full Exhaust System Stainless Steel Performance Upgrade Maximize the power and sound of your BMW E9X M3 with a high performance full exhaust system, engineered for the 4. 0L S65 V8. This system is designed to optimize exhaust flow, delivering significant horsepower and torque gains while producing a deep, aggressive exhaust note without high pitched rasp. Available with 1 5 8" or 1 3 4" primary tubes, it provides an ideal balance of