Hey guys, just wondering if there is any modification required to the factory 3rd gen fuel rail or any other mods for that matter, to put 850cc's in for primaries and 1300cc for secondaries.
TIA!

 

- It really comes down to the mods that you have or are planning on getting.

- If you are not going with a single turbo, then have your primaries stay at 550's and your secondariness to 1300's. There is no modifications needed for the fuel injectors to fit in the rail.

- If you are pulling more than 400 RWHP and have a single turbo, you will want to bore out the primary injectors to 720s and get a fuel rail for the secondary injectors. Now you will have 1600s as your secondary injectors and 720s as your primary injectors.

- Most single turbos pull about 370 RWHP and the primary injectors 550cc will be fine, however, your secondary injectors should be 1600cc and you will need to get a fuel rail.

- *Tip* Do not use your secondariness injectors to replace your primary injectors. For example, don't put the 850's in your primary injectors, because it will not fit very well.