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Go with jb4 stage 2, they come with flex fuel wires already.
The 3 most notable power gains are
Jb4 stage 2
Catless downpipe
E85 flex fuel
Example
Last night I raced a 2014 Challenger SRT8 0-80 (when I let off) and had no problem taking it. Got ahead stayed ahead
I have 2011 535i xdrive m sport
Jb4 stage 2 on map 5
75/25 mix of 93/e85 fuel
Dr. Euro Catless downpipe
Custom intake
VRSF charge pipe
Muffler delete with quad tips
If you look on this forum and buy appropriately you can have everything for under $1000 and it's a night and day difference. That's a lot of bang for your buck.
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