06-15 Civic Si Flex Fuel Kit 500-800Hp

ETA to be back in stock 7/20/2026 DO NO EMAIL! our latest eta! DO NOT ORDER!!!! NO PRE-ORDERS
New kits will all come with quick release fittings more details soon! Please DO NOT EMAIL! Our latest eta to have kits finished! NO PRE ORDER! 

What Makes Our Kit Different?

We are proud to be the first to offer a complete 8th and 9th gen Si fuel system kit featuring Quick Release fittings throughout the entire setup. No more struggling with AN wrenches or scratching fittings during installation and maintenance. Our Quick Release design allows the fuel lines to be removed quickly and easily without the need for any special tools.

Unlike standard rubber-lined fuel systems, our kit is exclusively built using high-quality PTFE braided hose. This provides superior durability, reliability, and fuel compatibility for both street and race applications. The system is fully compatible with pump gas (91/93 octane) as well as E85 fuel.

Our kit completely replaces the factory OEM hard lines from the fuel tank all the way to the fuel rail, creating a cleaner and higher-flowing fuel delivery system.

It includes:

• 8AN feed line

• 6AN return line

• Return line routing from the fuel pressure regulator back to the fuel 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:

• Fuel pressure regulator  Weldon regular # WEL A2040-281-A-120 or Ktuned # KTD-FPR-10B

• Flex fuel sensor- Part number 13507129

• Fuel Filter-  Part number Magna 7009
• Fuel pump - Walbro 450 #f90000267 or walbro 525 f90000295
• ktuner flex fuel converter kit