# Keep my current duals or go with a single exhaust?

**URL:** <https://forums.speedlife.net/t/keep-my-current-duals-or-go-with-a-single-exhaust/186966>\
**Category:** PittSpeed Automotive\
**Created:** [December 22, 2006, 3:50pm UTC](https://forums.speedlife.net/t/keep-my-current-duals-or-go-with-a-single-exhaust/186966 "2006-12-22T15:50:24Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![fmfkid250](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fmfkid250/32/5973_2.png) [@fmfkid250](https://forums.speedlife.net/u/fmfkid250)\
**Post date:** [December 22, 2006, 4:34pm UTC](https://forums.speedlife.net/t/keep-my-current-duals-or-go-with-a-single-exhaust/186966/15 "2006-12-22T16:34:26Z")

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> [@RidinDirtyCrx's Build Thread (Now Running)](https://forums.speedlife.net/t/ridindirtycrxs-build-thread-now-running/26260/9):
>
> he wont be running a big turbo tho… so wouldnt a 4inch be too big for a small turbo? you need some back pressure to get turbos to spool quickly.

there will be “some” back pressure in a 4"

4" is better for the motor in many ways too. less pressure, less heat, more power.

I dont know where u heard you need “some” back pressure helps turbos spool better…  
in all the boosted cars I have owned/worked on it works best with the least amount of pressure physicaly possible. how many have you tested?

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