# custom built 3inch dp

**URL:** <https://forums.speedlife.net/t/custom-built-3inch-dp/229339>\
**Category:** NYSpeed Automotive\
**Created:** [March 16, 2013, 5:29pm UTC](https://forums.speedlife.net/t/custom-built-3inch-dp/229339 "2013-03-16T17:29:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![benmtx5](https://avatars.discourse-cdn.com/v4/letter/b/9fc29f/32.png) [@benmtx5](https://forums.speedlife.net/u/benmtx5)\
**Post date:** [March 16, 2013, 5:29pm UTC](https://forums.speedlife.net/t/custom-built-3inch-dp/229339/1 "2013-03-16T17:29:48Z")

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thinking of building one for my saab, Have full access to weld,machine shops so its no issue  
main concern is catalytic converter, Go with a universal,? weld in reducer to go from 3 inch back to 2 inch?, I also noticed the outlet of the turbo is obviously smaller then 3inches, So should i cut the old dp with a few extra inches and go 3 inch from that?

Thanks