I had an eBay downpipe and I was smoking bad. Had to go back to stock. But I just put on the Sure RMM. Feels nice. But I think I have an axle going out so I'll have to take it in.
Some people have trouble with the turbo smoking. When I had my down pipe mine smoked. Put the stock catted one back in and it's fine.
Front rear diff mount and bolts was replaced by Mazda last week because the mount sheared off the bolts.
That's about it for me