What fuel rails can fit on a NA S4?
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Junior Member
Joined: Feb 2024
Posts: 5
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From: Wisconsin
What fuel rails can fit on a NA S4?
Before anything else, I could not find anything in the forums about aftermarket NA S4 rails and interchangeability.
I was looking at the FFE fuel rails, (https://fullfunctioneng.com/product/...3b-t-rail-set/), and noticed it said 13B-T. I haven't been able to find any rails that say anything other than 13B-T. Can the S4 Turbo rails fit on a S4 non-turbo? Primary and Secondary. If not, what options do I have?
I was looking at the FFE fuel rails, (https://fullfunctioneng.com/product/...3b-t-rail-set/), and noticed it said 13B-T. I haven't been able to find any rails that say anything other than 13B-T. Can the S4 Turbo rails fit on a S4 non-turbo? Primary and Secondary. If not, what options do I have?
Full Member
Joined: May 2019
Posts: 99
Likes: 11
From: Greensboro, NC
welcome to the board. 
the primary rails will interchange between N/A and T2 (at least, they will bolt to the housing), the secondaries will not interchange though.
what exactly are you trying to do?
the primary rails will interchange between N/A and T2 (at least, they will bolt to the housing), the secondaries will not interchange though.
what exactly are you trying to do?
Thread Starter
Junior Member
Joined: Feb 2024
Posts: 5
Likes: 0
From: Wisconsin
i just wanted to know what my options were for the future if I ever wanted/needed to get bigger rails and a better fuel system. I couldn't find anything aftermarket for an S4 non-turbo.
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