COMPATIBLE: (2.0L - K20Z3)

2006 - 2009 HONDA CIVIC SI 

Material: Stainless Steel Surface: Mirror Polish 4-1 piping; 1-piece header design

100% T-304 Stainless Steel with a Polished Finish Direct bolt-on, increased exhaust flow for improved engine performance Si model only

Boost Horsepower and torque, and Save on Gas with Headers and Exhaust System Modifications!" Replacing a vehicle’s headers and exhaust is a way to add horsepower and torque, and it will also increase your vehicle’s volume. Want a car that sounds like an American muscle car should? This header will help your vehicle achieve that and it can add up to 8-20 horsepower. Install an exhaust system means about a 0.5 mpg gas mileage improvement. While that might not sound like much, consider this: If gas costs $3 a gallon and drive this truck 15,000 miles a year, you’re saving yourself about $85 a year on gas. In five years, you’ll have saved nearly enough money to pay for a complete cat-back exhaust system.