You've got your Headers then its connected to your H or X pipe then at the end of your H or X is the Cat-Back or After-Cat Exhaust. It is called a cat-back because it hooks up from the catted X or H pipe then runs over your solid axle and out the back. But with the '99 and up Cobra's it runs under the IRS.
Heres a web-site http://www.magnaflow.com/03cat-mustang.htm
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1999 Mustang Cobra
Solid Axle w/ 4.56's
Magnaflow Cat-Back
Dr.Gas O/R X-Pipe
JBA 1-5/8ths Shorty Headers
Homemade Powerpipe
March Pulleys
JMS Chip
Steeda Tri-Ax Shifter
Best E.T. w/ parts listed & BFG 275/40/17 D/Rs (10-26-'02; not including JMS Chip)- 12.95 @106.82, 1.79 60FT.
Best MPH- 107.43
New Best MPH (4-26-03)- 109.45
316 RWHP/ 309 RWTQ
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