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Originally Posted by marvinp
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one other thing: downpipes! downpipes will add the most power for a bolt on. more than an exhaust, intercooler, intake, etc. (not a tune, however). if you don't live in california, you can run catless downpipes easily without worrying about emissions. i run AR design 3" downpipes, they were around $700. honestly though, you can buy a set of $150-200 downpipes and get almost the same level of perforamance
not to mention, the car sounds beastly with catless downpipes. just don't forget either a bms dpfix or run a procede. those are the only two ways you can run catless downpipes without throwing codes and CEL'S/SES's