If you going to fab your own, if you copy the TRD design it runs parallel to the width of the battery also to note the maf is placed in the middle.
Because the tube goes parallel, the TRD desugn uses a 45 degree couple which I've heard can be hard to source.
injen and the rest design sweeps away from the battery in an upside down V Path. Then used a straight coupler than 45 deg. To join with the throttle body bl