6a12 non turbo have very weak manual transmissions. The differential likes to go bye bye on them.
The only way to make power is with turbo. You can do a single turbo with whatever is available in your country - garretts or whatever. You can make decent power on 8-10 psi of pressure. You can buy a MAFT online, I'd suggest MAFT gen 2. Its a bit more expensive, but its well worth it. You can also tune it with SAFC which is less expensive. I've run upto 15psi on a big turbo and stock ECU with SAFC
Exhaust from 2g eclipse fits with some extending and I wouldnt go bigger than 2.5 inches.
Cold air intakes and other mods dont really work.
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