what is the best header/exhaust combo for 2006 si 2dr???
That is not the best, plz try again.i think he means most power.
skunk 2header / 3 inch full race exhaust
Go Go Powers Activate!!
That is not the best, plz try again.
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LMAO!Go Go Powers Activate!!
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Here comes the Brigade! The OP is a too vague, but if money is not part of the equation go with the Go Power custom header and 3" exhaust. If money is part of your decision then the Go Power 850 mated to the 3" is another option. For a budget route I would say Vibrant. Also Go Power has the 575 header which I have and love.