I went to an exhaust shop today, and wanted to get a hotbits 4-2-1 extractor.
The shop fellow showed me a used hotbits extractor for 1 year, and it was slightly crack, the air flow can't go through nicely...and the metal, my god...it was damn THIN. The quality of the metal is just like a scrap metal.
Besides that, he showed me Powerzone's extractor, it was only used for around 1.5year, and the cracking was quite obvious, but i dunno about u guys' one...