I have tried an off-road H pipe before and felt it didn't offer the top end power or the torque of the X pipe with cats. i have never tried an off-road X pipe but I can say the difference was very noticeable between the X and H in the favor of the X pipe. It sounded quieter but gave more power. I remember thinking, man the exhaust sounds awesome with the offroad H pipe but the power wasn't there like it was with the X. I feel like the X gives power gains everywhere but that was in my car. others may be different.
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