Here is a link to where to buy the timing kit. You can watch youtube videos to make sure you time it correctly.
https://edgeautosport.com/mazda-oem-vvt-replacement-kit-mazdaspeed-3-2007-2013-mazdaspeed-6-2006-2007/
Mods are the same for the Mazdaspeed3 so people always recommend getting the...
Intakes from the Speed3 should fit the CX7. Versatune is the only ECU flash that allows for tuning the ECU. All exhaust systems for the CX7 have been discontinued so you only options are finding someone parting out their car or doing a custom exhaust.
That is the bypass valve to release pressure when your throttle plate closed so the pressure doesn't force it way back and damage the turbo. I would recommend getting an aftermarket one. Same as a Mazdaspeed3.
Link to OEM one on Ebay.
https://www.ebay.com/p/1761626257?iid=124412914420
Here...