Blueflame full exhaust quiery

[M87NER]

Hi, could some one tell me what the difference between these two blueflame exhaust systems on the link below....as one of them has a 's' in the reference number.
http://www.onlineautomotive.co.uk/search_results.php?
cheers.

 

[m0rk]

one's Cat back, the other's turbo back.

 

[M87NER]

Thanks