Hey guys i wanted to ask on opinions for quad exhaust set up for the 135i. Im currently running a 09 135i which i am planing on building as a show car, however my personall philosophy is that if a car looks mean, it better drive mean, so while i throw my money at this to look great, i do want this so perform amazing. Im currently in Calgary Alberta and the nearest track that i know of is 3hrs north of me, so i wont be tracking it every weekend, however i still do drive it pretty agressively and my first power goal is 450whp. I do want to run the quad set up. after looking into it it seems that im either left with a few options. 1) Spend a grand alone to relocate the battery and charcoal filter, to that one the 1M, and then spend money on the exhaust. 2) Run the exhaust as per oem, and then branch the tips off and across to get the look of the quad however, you will have crazy unequal lengths and loose performance down the road. or 3) Figure out a third alternative to relocate the filter find a way to run the exhaust. Im curious on how some of you guys got it done and the outcome.