# Dr.Jekyll Exhaust = works well on new setup

**URL:** <https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909>\
**Category:** SON240sx Automotive\
**Created:** [November 16, 2008, 4:47am UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909 "2008-11-16T04:47:22Z")\
**Posts on this page:** 1\
**Showing post:** 36

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**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\
**Post date:** [November 28, 2008, 4:27am UTC](https://forums.speedlife.net/t/dr-jekyll-exhaust-works-well-on-new-setup/119909/36 "2008-11-28T04:27:02Z")

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> [@I SUCK DICK and MAKE 5HP per liter PLUS I HAVE A SWEET TIGER tattoo club](https://forums.speedlife.net/t/i-suck-dick-and-make-5hp-per-liter-plus-i-have-a-sweet-tiger-tattoo-club/19290/30):
>
> first off awesome piece and great write up, couple of questions  
> when the dump is open are you running a limp mode full rich due to the fact that your o2 bung is on the exhaust side? if that is your o2 bung i think more power could be had (dump open) if the 02 was positioned closer to the turbo  
> also have you done a pass with the dump closed to see if you lost any power compared to the orig down pipe?  
> just asking caz im interested in doing somth similar?

I think you need to do mor reading on what an O2 sensor **actually** does, and the differences between open or closed-loop. I think if you did some more reading you would be able to answer you own questions.

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