# My 07 Si

**URL:** <https://forums.speedlife.net/t/my-07-si/241544>\
**Category:** Builds\
**Created:** [January 23, 2009, 12:37pm UTC](https://forums.speedlife.net/t/my-07-si/241544 "2009-01-23T12:37:22Z")\
**Posts on this page:** 1\
**Showing post:** 153

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**Author:** ![Mk4\_30R\_Ban](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mk4_30r_ban/32/6347_2.png) [@Mk4\_30R\_Ban](https://forums.speedlife.net/u/Mk4_30R_Ban)\
**Post date:** [February 8, 2009, 11:13pm UTC](https://forums.speedlife.net/t/my-07-si/241544/153 "2009-02-08T23:13:41Z")

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> [@150+ MPH](https://forums.speedlife.net/t/150-mph/13797/22):
>
> Don’t put it on, you literally won’t gain any power. I raced my friends 04 Type-S before and after he installed a shitty intake (AEM V2), a shitty shorty header (like yours) (a DC) and a shitty set of useless pulleys and pulled him exactly the same amount as I did when he was stock, if not a little more. There’s not even a noticeable change in exhaust note with a shorty header, just don’t even bother and sell it to someone who is looking to waste his/her money :thumbup

if you arent telling the computer that more air is coming in, and more air is leaving you wont gain much from it. you have to tune for your mods. the ecu can only compensate for so much.

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