Instant Horsepower Boost! 3″ STi Downpipe w/ High Flow Cat
The stock sti downpipe and cat are some of the most restricted pipes we’ve EVER seen. Nasty! I like this pipe because not only does it replace the stock downpipe, it also repalces the...
The stock sti downpipe and cat are some of the most restricted pipes we’ve EVER seen. Nasty! I like this pipe because not only does it replace the stock downpipe, it also repalces the...
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