Ok i knew that already but its so heavy and I don't have any leaks anywhere else.
question is how can i decrease it or totally remove ! Let's say if i installed a small resonated pipe will it work?

 

How would a resonator do anything to decrease the smell?

 

Idk, because as I remember when i had a straight pipe there was no smell, but when i re installed the mufflers the smell came back

 

If u keep driving really fast then the smell wont be able to catch up to u.

 

When you gut out the cats it's going to smell like gas-heavy exhaust since you literally removed the filter that's getting rid of that smell.

The only "fix" would be another set of cats.

Muffler (straight pipe) and catalytic converters are completely different components. The cats are what removes the smell, the muffler is what removes the noise.