You need to provide a lot more info as to what your goals are. If you want a high revving engine than an a2 or z1 might be your best option. If you want torque look into a K24. The K24a2 is a nice no-hassle kind of swap but will require KPRO just like the others i mentioned. A k24a1 will swap in and allows you to use your stock ecu with larger injectors. The a1 and a3 are great for boost too so that might be something to consider. Overall this topic has been covered countless times and i'm sure if you do a search on here you can find more info than you will ever need.
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