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Has anyone used these headers?
http://www.msdsinc.com/ho334.html

If you have are there any hp gains?
 

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Has anyone used these headers?
MSDS - Exhaust Systems

If you have are there any hp gains?
This header was designed for the 2nd gen Mazda 3 skyactiv which has a stock 4-1 header and a cramped engine bay... They may not fit the 3rd gen. The header has many design flaws and recently produced poor performance on the dyno. Your stock header has a far better design for the skyactiv engine.

There was a thread on this:

http://mazda3revolution.com/forums/...msds-tri-y-skyactive-race-exhaust-header.html
 
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