i have them as well. id suggest buying some different gaskets and a new set of bolts. the ones supplied were absolutely terrible. otherwise, they've been running great for me at almost 20k miles (i got them on within the first thousand miles hehe). another problem is that you will eventually get a SES light. either buy some o2 extenders (z1 sells a pair) or stuff a thickly rolled ball of steel wool into the o2 bung
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