i have an 07 and looking to install some downpipes.
i've never done emissions test before, and recently read a few articles that commented on an e-test every 2 years.
i was also told that i can do the e-test now, then install the downpipes, and when my bday aug 6th 2012 comes around, my e-test results are still valid.
any advice on this matter?
BMW E92 335i
retired: 04 BMW M3 | 05 Honda S2000 | 03 BMW 330ci | 01 Honda Prelude | 99 Acura Type-R