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down and up pipe and tune, i did K&N typhoon CAI first. its nice ### i could here the spool and a nice sssssshhhhhh sound wen gas is released. down, up pipe and tune = better wrx. release lag off the TD04. do ebay down and up pipe. i got them and over a year wit no problems. i even went 8 months wit out a tune witht them. but get the tune
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