The Stage 1 is good up to about 330bhp and Stage 2 up to about 350bhp. To get larger bore hoses you need to go with a Stage 3 which comes with RS sized inlet and outlet and the bigger silicone hoses to fit to the standard ST hot side and throttle body. Thats good for up to around 425bhp.
2.3 EcoBoost 5-dr . 350 . 175 : 10.0 (28.2) 6.3 (44.8) 7.7 (36.7) 266 (165) 4.7 . 脴Ford test figures. 脴脴The declared Fuel/Energy Consumptions, CO 2 emissions and electric range are measured according to the technical requirements and specifications of the European Regulations (EC) 715/2007 and (EC) 692/2008 as last amended. Fuel consumption 2018 Ford Focus ST2=/=Metallic Blue PERFORMANCE: Velossa Tech Big Mouth Ram Air/Steeda Intake pipe with Steeda airbox/Mountune Symposer Delete/Thermal Research Turboback/Mountune DI injectors/Levels Performance FMIC/HKS SQV4 endtank mounted/Treadstone Factory BV Plugged/BoomBa Racing Shifter Base & Cable Bracket Bushings/Ford Racing Short Shifter/COBB v3 Accessport/Sunoco 260 GT 100 octane 82 posts 路 Joined 2013. #1 路 May 30, 2013. Hi guys after some help and advice is it really worth upgrading my ST with the 440cc standard RS injectors. I have other mods on car such has full exhaust system and sports cat uprated intercooler induction kit and stage 2 remap. Would I really feel much difference if I upgrade the injectors. Hey the I got Ford Focus st mk2 stage 2 320bhp The car had new Remove head and all parts that require to renew New head gasket New valves Head was sent away to be pressure tested and skimmed (w.m.bates) Mod block fitted New turbo sensor New fuel trim sensor fitted to fuel rail New cam belt, water pump and all pulleys Amor A forum community dedicated to Ford Focus ST owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Full Forum Listing My car is currently stage 2.5. I have all the stage 3 mods except RS injectors and a stage 3 map. Currently I run DSCI which is really stage 1 or 2 but I figured if I've got all the mods to run a higher power map then I should go for it. I have narrowed it down to 3 maps and I will explain why:Hi guys, new here, new to upgrading parts too. Probably on wrong thread. I currently have a 08 st, already has intercooler, unsure on stage 1 or 2 tho, induction, plenum, exhaust, remap, unsure on what one as was on when bought, and been block modded.