the down pipe, also called a test pipe on some cars eliminates the cats and emissions makes it so you have to have them but if you dont have emissions testing then you wont have a problem.
Emissions tests I live in Cali, you just have to know the right people. I had all non-carbed mods on my fronty passed emissions. Just got give the guya big enough tip to glance past that stuff! :ihih:
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