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2.4 swap is def. worth it more power and torque then the dohc
Correction. The power is the same, it's the torque that is different.
To the OP, If you want to get quicker, swap to an MTX. It is a world of difference. If you wanna stick with the ATX, then look at this site... http://www.halfahemi.com/fastatx/
Damn I wish I went to school for auto mechanics. I just called a local shop and they said $2000 in labor w/o equipment for a tranny swap and $1500 for an engine swap w/o engine just in labor!
nothing compares to a stick, but the ATX can be made fun with a stall converter and shift improver kit. Level 10 can provide both with their Convertors and Hydro System Valve Body.