gnade. The factory cast headers are okay until you do mods to engine , other than capacity change. Depending on what you intend to use celica for, if modified, use 4 into two into one or tri y for road use. They give a broader and less peaky torque curve. For regular track use four into one are best choice. I haven't got tuned lengths readily available but with research you can get idea of tube lengths for your power range. Type depends on regular used power range i.e use torque band tri y or higher rev hp range four into one.
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