This picture shows the difference between the standard exhausts (left) and those fitted by Tickford (right) to the TL50.  Note the use of twin pipes all the way back, including twin mufflers and balance tube.  The much improved ceramic coated headers feed into larger catalytic converters for a better sound and of course that all important 200kw.  Photo taken at the 2000 Tickford Open Day inside the Tickford Factory where Mustangs are now converted along side the T-series.