# Installing aftermarket filter, but what are these? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [October 22, 2004, 3:27pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817 "2004-10-22T15:27:19Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![zallow](https://avatars.discourse-cdn.com/v4/letter/z/49beb7/32.png) [@zallow](https://forums.speedlife.net/u/zallow)\ **Post date:** [October 22, 2004, 3:27pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/1 "2004-10-22T15:27:19Z")
Hey there, I just bought a 3" aftermarket filter for my s13 zenki. I know it’s a very simple install, don’t need any help for that. But I saw somethings coming out the airbox I don’t know what they are and if they’re really useful. So just wanna be sure. Looks like another sensor connecting to the MAF and some type of cubic box connecting with a rubber pipe directly in the airbox: ![http://www.boomspeed.com/zallow/pictures/sensor_and_cubic_box.jpg](http://www.boomspeed.com/zallow/pictures/sensor_and_cubic_box.jpg) Close up of that other sensor thing: ![http://www.boomspeed.com/zallow/pictures/other_sensor.jpg](http://www.boomspeed.com/zallow/pictures/other_sensor.jpg) So do I really need those things to make the engine work? Will it damage anything in any way if I unplug these and install the filter without plugging them back in any way? Thanks for the help. Zack ---
**Author:** ![nocwage](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nocwage/32/5489_2.png) [@nocwage](https://forums.speedlife.net/u/nocwage)\ **Post date:** [October 22, 2004, 3:33pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/2 "2004-10-22T15:33:25Z")
One is an airtemp sensor, the other is your EGR system Exhaust Gas Return. ---
**Author:** ![nocwage](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nocwage/32/5489_2.png) [@nocwage](https://forums.speedlife.net/u/nocwage)\ **Post date:** [October 22, 2004, 3:34pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/3 "2004-10-22T15:34:33Z")
BTW, you’ll have to disable the EGR system, otherwise raw exhaust will be pumped out of that hose and into your engine bay… plus it’ll sound funny. ---
**Author:** ![zallow](https://avatars.discourse-cdn.com/v4/letter/z/49beb7/32.png) [@zallow](https://forums.speedlife.net/u/zallow)\ **Post date:** [October 22, 2004, 3:37pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/4 "2004-10-22T15:37:35Z")
how do i disable this EGR system? this thing is to reburn some emissions i guess? so it’s only for environmental purposes? if i leave the pipe next to the filter it’s gonna absorb those back in even if it’s not tighly fitted… sound funny, what do you mean? well i guess i could try it out, hehe… but what about the airtemp sensor? is it really useful? if i absolutely need it, how do i hook it back with the aftermarket filter? ---
**Author:** ![zallow](https://avatars.discourse-cdn.com/v4/letter/z/49beb7/32.png) [@zallow](https://forums.speedlife.net/u/zallow)\ **Post date:** [October 22, 2004, 4:03pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/5 "2004-10-22T16:03:22Z")
ok, i just found out i should put a breather on the rubber pipe and hide it so cops can’t see it if they have to pull me over and check my engine. Thanks Gonad! 😉 I’ve never been pulled over for an engine checkup, but eh, don’t really want to risk it, hehe. 😛 Also, I wanted to know a detail about this EGR pipe. Does it sucks air in or blows it back in the airbox? Sorry for the stupid questions. I wasn’t expecting to deal with this, hehe. 😛 As for the airtemp sensor tho, what can I do about this one? Do i really need to plug it back in some way, or doesn’t really matter if it’s not plugged back in? ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [October 22, 2004, 7:42pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/6 "2004-10-22T19:42:46Z")
> [@nocwage](#): > > BTW, you’ll have to disable the EGR system, otherwise raw exhaust will be pumped out of that hose and into your engine bay… plus it’ll sound funny. Ever cut the hose and put a breather filter on it? ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [October 22, 2004, 9:04pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/7 "2004-10-22T21:04:14Z")
Actually guys thats not the EGR that’s AIV. What that does is when the car is at idle it takes fresh air and sends it to the cat to keep it glowing instead of filling up with fuel and clogging up. You can do one of two things. Remove the whole AIV system and join together the Vac. Lines and just giver’ once and a while to keep things flowing or like Brandon said put a little Breather filter on it. The EGR is located behind the block inbetween the Firewall and the Head. As for that sensor in the BOX thats the AIT sensor. You will need that, just ziptie it as close as you can to the Intake Filter or do what I did and cut a hole in your intake piping after the MAFS and insert it there. ---
**Author:** ![zallow](https://avatars.discourse-cdn.com/v4/letter/z/49beb7/32.png) [@zallow](https://forums.speedlife.net/u/zallow)\ **Post date:** [October 22, 2004, 9:17pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/8 "2004-10-22T21:17:33Z")
alright! thanks ALOT for clarifying everything for me man! really appreciate it. 😃 So for the AIV, i’ll prolly do what Gonad told me and extend the hose somewhere where it’s not visible and install a breather on it. That way if cops pull me to check out my engine, they prolly won’t find it. Like I said i’ve never been pulled for that before, but can’t risk it. And for the AIT, i’ll prolly do what you said SHIFT\_SR20DET. As long as it gets fresh air to read the right temperature right? If it reads too high, what will happen? Engine gonna stop? I was planning to get a little 45° bent tube to attach the MAF on so it’ll face downward and forward as much as possible. Cause now if I attach the filter directly on the MAF, it faces toward the strut tower. Look kinda stupid anyway… 😛 So thanks alot guys for the advices, I’ll let you know how it turns out. 😉 Zack ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [October 22, 2004, 9:28pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/9 "2004-10-22T21:28:06Z")
As long as the MAF is further than 6" from the TB you are :thumright: ---
**Author:** ![GreyGandalf\_S14](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/greygandalf_s14/32/5475_2.png) [@GreyGandalf\_S14](https://forums.speedlife.net/u/GreyGandalf_S14)\ **Post date:** [October 26, 2004, 10:49am UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/10 "2004-10-26T10:49:36Z")
EGR system re-circulates expelled exhaust gasses on cold start up, it helps warm up the motor faster. i plugged in my iat sensor and zip tied it to thet chassis, no problems since. before i left it unplugged, and my rpm’s would race occasionally. all the solutions the guys gave you will work, see which one your car likes best, they kinda have minds of their own. 😉 ---
**Author:** ![zallow](https://avatars.discourse-cdn.com/v4/letter/z/49beb7/32.png) [@zallow](https://forums.speedlife.net/u/zallow)\ **Post date:** [October 26, 2004, 12:43pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/11 "2004-10-26T12:43:59Z")
That’s what it looks like up until now: ![http://www.boomspeed.com/zallow/pictures/AIT%20custom%20fitted.jpg](http://www.boomspeed.com/zallow/pictures/AIT%20custom%20fitted.jpg) ![http://www.boomspeed.com/zallow/pictures/custom%20filter.jpg](http://www.boomspeed.com/zallow/pictures/custom%20filter.jpg) I only need to find 2 more nuts for the screws and gotta buy that breather for the AIV pipe. Is it gonna be really loud if I don’t put a breather on it? 😛 ---
**Author:** ![spilner](https://avatars.discourse-cdn.com/v4/letter/s/f17d59/32.png) [@spilner](https://forums.speedlife.net/u/spilner)\ **Post date:** [October 26, 2004, 12:52pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/12 "2004-10-26T12:52:10Z")
rip it all out you’ll be fine… im walking proof. well maybe not fine, but you’ll exist. ---
**Author:** ![roast](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/roast/32/5498_2.png) [@roast](https://forums.speedlife.net/u/roast)\ **Post date:** [October 26, 2004, 12:57pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/13 "2004-10-26T12:57:40Z")
looks good man! As long as you explain that where the breather is, it’s an AIV, then the cops shouldn’t bother you. ---
**Author:** ![imported\_deeznutz](https://avatars.discourse-cdn.com/v4/letter/i/e79b87/32.png) [@imported\_deeznutz](https://forums.speedlife.net/u/imported_deeznutz)\ **Post date:** [October 26, 2004, 8:42pm UTC](https://forums.speedlife.net/t/installing-aftermarket-filter-but-what-are-these/81817/14 "2004-10-26T20:42:14Z")
Quote"GreyGandalf\_S14" EGR system re-circulates expelled exhaust gasses on cold start up, it helps warm up the motor faster. Correction EGR does not re-circulate expelled gases on cold start up. They re-circulate exhasut gases into the intake to lower combustion chamber temps, which will in turn reduce NOx. Simply emissions related. -deez