# Sick/Clean Engine Bay

**URL:** <https://forums.speedlife.net/t/sick-clean-engine-bay/248747>\
**Category:** Shift518 Automotive\
**Created:** [December 1, 2009, 6:29pm UTC](https://forums.speedlife.net/t/sick-clean-engine-bay/248747 "2009-12-01T18:29:38Z")\
**Posts on this page:** 1\
**Showing post:** 720

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**Author:** ![TurboTravis](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/turbotravis/32/6406_2.png) [@TurboTravis](https://forums.speedlife.net/u/TurboTravis)\
**Post date:** [November 30, 2010, 1:59pm UTC](https://forums.speedlife.net/t/sick-clean-engine-bay/248747/720 "2010-11-30T13:59:16Z")

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> [@FS/FT: 02 Civic SI with JDM K20A Type R conversion](https://forums.speedlife.net/t/fs-ft-02-civic-si-with-jdm-k20a-type-r-conversion/37557/24):
>
> i thought the pistons on the 99-02 were hypereutectic not forged and on the ACR the motors were forged. am i wrong?

AFAIK, all 92-98 Vipers had forged pistons, and all 99-02 were hypers. The ACR’s got another 10HP from smooth tubes on the air intake.

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