# 2.5 Vs 3" FMIC piping **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [March 29, 2006, 8:35am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973 "2006-03-29T08:35:36Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Viper966](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/viper966/32/7268_2.png) [@Viper966](https://forums.speedlife.net/u/Viper966)\ **Post date:** [March 29, 2006, 8:35am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/1 "2006-03-29T08:35:36Z")
Im changing my FMIC piping to aluminum because its cheaper than getting my current piping chromed or jet hot coated… sooo since im changing it i was wondering if it would be a good idea to up the size of it currently im running 2.5" intercooler piping, but i was thiking of switching to 3" there is only a 25 dollar differance total for the upsize, would i see any change in performance either way? my new FMIC is 3" in and out and my new TB has a 65mm inlet which is like 2.8 in ---
**Author:** ![Nikuk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nikuk/32/7254_2.png) [@Nikuk](https://forums.speedlife.net/u/Nikuk)\ **Post date:** [March 29, 2006, 8:36am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/2 "2006-03-29T08:36:36Z")
how much air are You moving? 10 lbs/min? no. 140 lbs/min? yes. and so on… ---
**Author:** ![Viper966](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/viper966/32/7268_2.png) [@Viper966](https://forums.speedlife.net/u/Viper966)\ **Post date:** [March 29, 2006, 8:43am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/3 "2006-03-29T08:43:05Z")
gt35R gonna run about 350ish for daily driver then UB3R boost on the dyno ---
**Author:** ![skatanic28](https://avatars.discourse-cdn.com/v4/letter/s/8e7dd6/32.png) [@skatanic28](https://forums.speedlife.net/u/skatanic28)\ **Post date:** [March 29, 2006, 8:52am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/4 "2006-03-29T08:52:24Z")
3" seems like overkill for 350whp, imo. ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [March 29, 2006, 8:53am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/5 "2006-03-29T08:53:32Z")
> [@skatanic28](#): > > 3" seems like overkill for 350whp, imo. yeah. it’s all about the CFMs. I don’t think you will push enough air to require 3" ---
**Author:** ![Zer0DazE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/zer0daze/32/7624_2.png) [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)\ **Post date:** [March 29, 2006, 8:57am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/6 "2006-03-29T08:57:26Z")
viper, figure out the area, you will see that 3" is huge and way too big for your app. have you picked up forced induction tuning yet? if not you should and read through it. theres a lot of good info that will help you with this project. mike (innovative) would also suggest this book. ---
**Author:** ![Viper966](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/viper966/32/7268_2.png) [@Viper966](https://forums.speedlife.net/u/Viper966)\ **Post date:** [March 29, 2006, 9:03am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/7 "2006-03-29T09:03:40Z")
ive read through maximum boost like 400 times cuz i kept it on the shitter ---
**Author:** ![zwarbyt](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/zwarbyt/32/7623_2.png) [@zwarbyt](https://forums.speedlife.net/u/zwarbyt)\ **Post date:** [March 29, 2006, 9:05am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/8 "2006-03-29T09:05:03Z")
OMG yes 1/2" = 50FWHP For REELZ ---
**Author:** ![Nikuk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nikuk/32/7254_2.png) [@Nikuk](https://forums.speedlife.net/u/Nikuk)\ **Post date:** [March 29, 2006, 9:12am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/9 "2006-03-29T09:12:49Z")
> [/QUOTE] > [@Viper966](#): > > gt35R gonna run about 350ish for daily driver then UB3R boost on the dyno > > [QUOTE=Nikuk] **how much air are You moving?** > > 10 lbs/min? no. > > 140 lbs/min? yes. > > and so on… :word: > [@newman](#): > > yeah. it’s all about the CFMs. I don’t think you will push enough air to require 3" :word: ---
**Author:** ![Zer0DazE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/zer0daze/32/7624_2.png) [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)\ **Post date:** [March 29, 2006, 10:40am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/10 "2006-03-29T10:40:58Z")
> [@Viper966](#): > > ive read through maximum boost like 400 times cuz i kept it on the shitter max boost is lame compared to this book. seriously. pick it up ---
**Author:** ![Viper966](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/viper966/32/7268_2.png) [@Viper966](https://forums.speedlife.net/u/Viper966)\ **Post date:** [March 29, 2006, 10:49am UTC](https://forums.speedlife.net/t/2-5-vs-3-fmic-piping/9973/11 "2006-03-29T10:49:01Z")
okie doke