hi guys, am looking at a bleflame exhaust and decat for my focus RS. ive never seen them on a car before but i know they make excellent quality zorsts for bikes. what are these like compared to the mongoose system? they seem to be a bit cheaper which is very appealing to me. is there a difference in diameter of the zorst? have any tests been done in magazines recently with regards to power increases? also if any body knows where i can get a mongoose system for the best price please let me know?

thanks in advance.
Rob.