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a 4" down pipe would be perfect for a rb, or 1j or 2j with a MASSIVE turbo, but on a sr, 3" is more than enough, now if your sr was complletely built stroked to a 2.2 with cams, and a full fuel system 720cc injectors+ pushed by a t61 then maybe, and this is almost a drag setup to utilize a full 4" exhaust, but ifyour thinking a 4" down pipe to a 3" exhaust system, again all not worth , spend you money and upgrade something else
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