Chevy Small Block Roadster Sprint 1-5/8" Stainless Steel Manifold Header H8069 402 The extender has a 7/8

The extender has a 7/8 hex head which is the same size as most O2 sensors and it makes them easer to install not like the straight sided extenders

Fit for Yamaha AEROX 155 NVX155 2018-2020

This complete top end rebuild kit includes everything shown: front and rear cylinders

Stator Assy: 2C0-81410-00-00 / 2C0-81410-01-00

8x Spark Plug 41-962

Chevy Small Block Roadster Sprint 1-5/8" Stainless Steel Manifold Header H8069 402 The extender has a 7/8Product Overview: 1. Exhaust headers are a key upgrade for boosting engine performance by improving airflow. Unlike restrictive factory exhaust manifolds, performance headers give each cylinder its own dedicated exhaust path, reducing back pressure and improving exhaust flow. 2. By minimizing exhaust interference between cylinders, headers help increase horsepower and torque. When paired with a high performance cold air intake and a cat back exhaust