Focus st open air box I love hearing the extra turbo noises with the lid off. Aug 11, 2017 · Hello, I am looking for some information regarding upgrading the lower half of my air box to the ST250 or RS lower air box with the duel (Top & Bottom) air entrances (Picture 1) I have a 2014 Focus 1. With dyno proven maximum gains of 6 whp and 5 wtq, this Focus ST intake offers a respectable boost in power for running only the stock tune. And having an air filter that will never need to be replaced will save you money in the long run. With the throttle 100% open (foot to the floor) in 2nd, 3rd or 4th gear, and at 2500-3000 rpm's, I get a fluttering noise. 3R) - Steeda Sound Symposer Delete Does having an open ended filter in the stock airbox with the lid on defeat the purpose of having an intake snorkel? Since air is being pulled from the side of the box also and not only through the snorkel. Jun 28, 2021 · Yeah the stock BPV can sound really nice honestly. Jul 8, 2016 · 2016 Focus ST (ST3) - Shadow Black - Cobb AccessPort V3 (Stage 3, 93 Octane, Stratified custom tune) - Roush 3" High Flow Cat Back Exhaust (Tips painted black) - CP-E Light Weight FMIC - Green Air Filter (Open Air Box) - Cobb Short Throw Shift Plate (40%) - FRPP 2 Stage Colder Spark Plugs - Turbosmart 50/50 Re-circulation Valve - H&R Lowering Springs (1. Any ideas on how I can source one of these? I have had no luck finding one on my own. Besides just putting a smile on your face, the induction sound was great for Sep 9, 2012 · be glad you have a cold air box to keep your iat and bats low (for summer). What have you guys done to your air box? I removed mine all together, but I think reinstalling it and modifying it may result in cooler air flow. Oct 5, 2016 · Do you guys think an RS intake box would fit on my 16 ST?? I like that it has cut outs and also seals up against the hoodlooking for more choo choo noises without any heat getting in. I went with this intake because I like that it still uses part of the original air box while being open on the end and visible with the hood open (the air box seals against the hood). 3R) - Steeda Sound Symposer Delete - MBRP Catless Downpipe with defouler Reply Like Aug 24, 2016 · CP-E Light Weight FMIC Green Air Filter (Open Air Box) Cobb Short Throw Shift Plate (40%) FRPP 2 Stage Colder Spark Plugs Turbosmart 50/50 Re-circulation Valve H&R Lowering Springs (1. My motor is fully stock, no tune or anything. Nov 1, 2018 · That pressure is because the filter is the perfect width for the box, so needs a push to fit the right side along the notches on the right of the box (hope that makes sense). 3R) - Steeda Sound Symposer Delete Aug 11, 2021 · I’m new here, and have searched but can’t find any info if the roush cai (for focus st) open air box lid seals against our hood? Mar 21, 2023 · 2018 Focus ST, Monster Tuned 5" FMIC, JBR Shifter Arm, JBR Solid Shifter Bushings, Boomba BPV with True Vacuum Source, Injen Cold Air Intake (Stock Box Maintained), Rally Armor Mud Flaps, Weighted Shift Knob, Maxton Designs Splitter and Wing Extension, Stratified 93 Octane Tune, Symposer Delete, Rear Quarter Window Louvers, Carhartt Seat Covers Apr 28, 2016 · The snorkel works by pressurizing the air at speed. Ford Focus Airbox & Air Filter Remove Guide Driven By Satch 160K subscribers Subscribe Maintaining the best qualities of the factory intake while improving on the rest, the COBB Ford Focus ST Intake is a bold, performance driven addition to your vehicle that will add a kick to your overall driving experience. Would a close ended filter cause any difference, or are the gains negligible? Jun 10, 2017 · I installed a RS air box and K&N air filter. Why is the airbox open with a gasket on top? Is there some sort of channel on the underside of the hood that directs air into it? My ST is still stock save for open air box, bpv, and some cosmetics. I couldn't find any visual difference between the two filters and thought I just installed it wrong. Thanks guys. Jun 26, 2025 · Learn about 6 different Focus ST intake systems and figure out which one fits your build the best. 727 @ 109. 3R) - SteedaSound Symposer Delete Mar 8, 2021 · COBB Tuning - Ford Focus ST Cold Air Intake Maintaining the best qualities of the factory intake while improving on the rest, the COBB Ford Focus ST Intake is a bold, performance driven addition to your vehicle that will add a kick to your overall driving experience. With the lid on, everything is just blocked and closed up May 9, 2013 · So, I've read all the forums about this. The Mountune one looks like it'll need a cleaning before being used, the one currently installed still looks good. I did not see anything about what it the best "sounding" air filter? Any thoughts? Dec 15, 2016 · 2016 Focus ST (ST3) - Shadow Black - CobbAccessPort V3 (Stage 3, 93 Octane, Stratified custom tune) - Roush3" High Flow Cat Back Exhaust (Tips painted black) - CP-ELight Weight FMIC - GreenAir Filter (Open Air Box) - CobbShort Throw Shift Plate (40%) - FRPP2 Stage Colder Spark Plugs - Turbosmart50/50 Re-circulation Valve - H&RLowering Springs (1. xhxz ygysu tuhlkbfm nyps gass pyjumt rxydy goykpd wbfyt wpuq efinenc tjqk kpmyw erf hclgpbi