You don't need cats, mufflers provide enough back pressure. Offroad H will give a little better TQ down low and the Offroad X will give a little better HP up top. Most people with 96-98 Cobra's make more power overall with the Offroad H, dyno wise at least.
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00 GT, MAC Offroad H, Steeda Pulleys & Timing Adjuster, 4.10’s, Flows w/turndowns, UPR shifter, UPR Pro Series LCA’s, Lakewood 70/30’s & 50/50’s, 253.8 RWHP/292.8RWTQ
12.91@101.93 (1.74 60ft)
M/M 100, 7085
2001 Mod Motor Shootout 2V NA Champion
Recent Pic from Moroso