You're going about this all wrong.
Folks upgrade injectors because they install larger intakes that cause the oem injectors to max out, risking the car running lean under high load.
Generally you don't install injectors first.
Here's a sensible idea.
Decide who you want to map your car and what your goals are.
Then ask them for their recommended parts list to achieve said goal.
But yes you can run a stage 4/4.25 with panel filters alone, however you've been asking questions about BOVs and intakes with regards sound, so I'm not sure that you know what you want tbh.
Arrived 29/5/09 Reborn 12/1/17
Engine built @ RiversideRacing
Litcho rods/pistons/RaceIC/BOVs/oil cooler/susp+handling kit/front diff
Race Developments ported manifold/AT Power TBs
RF street zorst+DPs
Xtreme18 Clutch/Dodson 1st gear+shaft/trans brace
2015 alloys/nav upgrade/Nismo cluster
DSC susp controller
DBA front/Varis CF bonnet/2016 Lights
TTE7XX turbos = >900bhp 700lbsft 30-130mph in 8.19s
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Last edited by charles charlie; 19th March 2018 at 03:46 PM..