I haven't looked at the ATX but I'm guessing the crossover/up-pipe would conflict with the transmission.
Someone have a picture of the ATX with the battery box removed?
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black