every thing is in the build of the motor & what you have put into it /phoenix depending on your friends setup and fuel management hes fine-dosnt matter if its a b20b or b20z really one has more horse & toque is all- but both have the same weaknesses- ur b18a1 is probably shot and would require more than 1000 to fix - 1000 in parts -2000 in labor to have that shop install those parts
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