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Yes you can change your tune to change the power curve...
I just put on a P & L long tube header no cat and had to change my cam and fuel maps...
I have an auto and need to maintain low end torque....
My car runs great with the EL long tube, better than I thought and I can add the cat for better torque but I don't think I need it...
But you can get a header from FT86 speed factory...... They have online sales........
and their header sounds great.......
I don't think anyone has done a side buy side test of headers yet....
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