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From what I've read most are 3" into 2.5" where the mid pipes are and that if there is a gain with 3" over 2.5" it's very minimal. Therefore find the downpipes that you like and fit your budget and put then on and be happy. The most important thing about downpipes is to go in knowing which ones fit properly and which have fitment issues. If your doing them yourself or paying somebody there's nothing worse than running into unexpected problems and losing more time or money than anticipated.
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2008 135i - MHD/JB4, MS DP's, AMS IC, UI CAI, CDV delete, M3 control arms/Links, RE Toe Link, ECS Trailing Arm, M3 rear SF & Trans bushings, SS brake lines, Michelin PSS.
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