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Its really not possible with the s5 rail as the FPR isn't removeable. With an s4 rail you get threaded ends with only the addition of a few washers to space it upward. With the right '90deg fittings you can lose the banjo bolts and have a slightly freer flowing rail. Replacing the FPR with one on the firewall would also just be simply easier at this stage as well.
The 4 x ID1000 actually made it easier to tune. FFE provided me with the inj dead time table which accounts for different flow in certain situations. Compared to the stock 550s, I have a MUCH smoother idle with very little AFR change (varies between .1).
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'15 Juke Nismo
'06 MX-5 GT SOLD
'04 S Silver RX-8 GT Track Day Use SOLD
'90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD
'89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD
'91 B2600i 4x4 w/ Rx-8 LSD SOLD
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