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3" otherwise you lose lowend torque and it'll seem like you've increased turbo-lag...if you're going to go with aftermarket turbo(s) then go 4" but only if you plan on exceeding 600rwhp .
Since you're turboed (1jz-gte), the less restrictive the exhaust, the better. Only NAs have the problem with losing low end power because of a bigger pipe.
exhaust pipe size?
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