06-11 Civic Si Flex Fuel System with Return Line

SOLD OUT! 
eta to be back in stock 5/20/25.

Please do NOT order as we don’t have any available. 

Fits 2006/2015 Honda civic si

 We only offer this kit with PTFE Braided line. What that means you can use it with pump 91 and 93, and e85. Our flex fuel line kit made 684HP on our yellow Rsx at 80 percent duty cycle running a walbro 525 and 2150 Fic injectors and 535HP with pump 93. 

 Our kit replaces all of your OEM factory hardline from the gas tank to the fuel rail.  8AN feed line and adds a 6AN return Line from the fuel rail back to the tank.

what’s all included

• 5 Custom Fuel Lines all pre assembled 
• Fuel rail fittings  
• Fuel filter fittings 
• Flex fuel fittings 
• Tank fittings 
• Regular fittings
• Fuel regular mount
• Flex fuel sensor mount  

Items NOT Included in our kits that you need: