# 3" Exhaust on stock header/cat?

**URL:** <https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992>\
**Category:** SON240sx Automotive\
**Created:** [February 18, 2006, 6:50am UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992 "2006-02-18T06:50:50Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![Blue\_S13](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/blue_s13/32/5563_2.png) [@Blue\_S13](https://forums.speedlife.net/u/Blue_S13)\
**Post date:** [February 18, 2006, 6:50am UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992/1 "2006-02-18T06:50:50Z")

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I am in a delema. I don’t know if a 3" exhaust will fit on the stock cat and header. Im wondering if all i have to do i get a cat that will fit to the header nice and exhaust nice.

Im open to any suggestions or help that you may have.

Thanks

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**Author:** ![Blue\_S13](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/blue_s13/32/5563_2.png) [@Blue\_S13](https://forums.speedlife.net/u/Blue_S13)\
**Post date:** [February 18, 2006, 6:54am UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992/2 "2006-02-18T06:54:40Z")

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I have left out some valuable info.  
It is a lightly modified KA motor. (Intake, cams)

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**Author:** ![BlitzSix](https://avatars.discourse-cdn.com/v4/letter/b/dec6dc/32.png) [@BlitzSix](https://forums.speedlife.net/u/BlitzSix)\
**Post date:** [February 18, 2006, 7:44am UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992/3 "2006-02-18T07:44:18Z")

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I had a 3" Bee\*R that bolted right onto the (stock) cat, if that’s what you’re asking…

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**Author:** ![GT1](https://avatars.discourse-cdn.com/v4/letter/g/b5e925/32.png) [@GT1](https://forums.speedlife.net/u/GT1)\
**Post date:** [February 18, 2006, 7:52am UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992/4 "2006-02-18T07:52:39Z")

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it should bolt right up… but really unless you are going to forced induction later on the max you need is a 2.5 inch pipe… itll still be nice and free flowing

GT

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**Author:** ![DirrtyDevo](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dirrtydevo/32/5547_2.png) [@DirrtyDevo](https://forums.speedlife.net/u/DirrtyDevo)\
**Post date:** [February 18, 2006, 9:16am UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992/5 "2006-02-18T09:16:18Z")

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the stock 2bolt flanges on our cars are huuuge. I managed to get mine on but it was tight.

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**Author:** ![Jesse](https://avatars.discourse-cdn.com/v4/letter/j/c77e96/32.png) [@Jesse](https://forums.speedlife.net/u/Jesse)\
**Post date:** [February 18, 2006, 2:28pm UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992/6 "2006-02-18T14:28:01Z")

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even a 4 inch works

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**Author:** ![project\_240sx](https://avatars.discourse-cdn.com/v4/letter/p/df705f/32.png) [@project\_240sx](https://forums.speedlife.net/u/project_240sx)\
**Post date:** [February 19, 2006, 8:47am UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992/7 "2006-02-19T08:47:48Z")

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just slap the exhaust onto your stock cat. it worked fine for me 😃

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**Author:** ![Blue\_S13](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/blue_s13/32/5563_2.png) [@Blue\_S13](https://forums.speedlife.net/u/Blue_S13)\
**Post date:** [February 19, 2006, 10:43am UTC](https://forums.speedlife.net/t/3-exhaust-on-stock-header-cat/92992/8 "2006-02-19T10:43:19Z")

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Thanks to everyone for your help and opinions.

It cleared up my delema, and very fast i might ad. 😃

Thanks.