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  1. Mazda3 (Axela)
    Hey guys, picked up a Mazdaspeed 3 not too long ago and the first thing I did was a VTCS delete. I read that doing a VTCS delete might make the car throw a P0421... What's the solution to this? Is it getting a 02 sensor extension?
  2. MazdaSpeed3 Modifications
    I know there's a ton of posts about this but I can't find any where the OP actually solved their issue, I had VTCS deleted, CS injector seals, throttle body and valve cleaning done all at once. ever since then I get KR all the way up to 8 at part throttle, especially right after moving from a...
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