From what I've read supposedly an x pipe will give you better flow and more performance gains over an h pipe.
Better gains with the back-pressure offered by the X-pipe, ideal for those running without Cats. However the H-pipe offers better/equalized flow, as long as the mid-connector pipe is open.
Also depending on what your exhaust/exit setup is, one can be more practical than the other.
2006 Aerodynamics Prior Design Racing 4.0 S197
*APDR Conversion (Body & Engine Bay)* -FR Transmission Swap- *Auburrn Gear HP Series LSD* -FR 4.10 Gears- *Cervini Type IV RAS* -Bama X4/SF4- *FR One Piece Driveshaft* -FR Ceramic Headers- *Custom MPC 12C "Hidden" Concept Exhaust* -Z26 Brake Kit- *Steeda & SR Adjustable Control Arms* -HID CCFL Headlights/Gen 5 LED Tailights- ETC
Last edited by GT500MUSTANGFAN; 09-23-2015 at 05:34 PM.