I'll definitely go for the heat wrap now. I had the heat shield on the stock manifold, Maybe the wrap was taken off. I have the space made for the o2 sensor in the down pipe, I looked for the 4 wire flange fitting sensor but couldn't find it, For now i'll just close it and have fun with the backfiring
and then get the sensor later.
These were some of the best tips ever, You are a real hatchi ruko expert, I guess you're pretty good at drifting. I can already imagine the oversteering fun 
We didn't push the engine forward 