have anybody used these parts before?
 

any good/bad reports?

http://www.japshop.co.uk/acatalog/JP-ICK-SUB01.jpg

http://www.japshop.co.uk/acatalog/LS-SUB01-FP25UC.jpg

all from japshop

and what is this thing i heard that if you change the cars cat. and somthing about the cell light lighting up???