I was running 13's and then I got a personal best of 12.2 when he tuned me. I also mentioned the e55's he got them running in the high 10's!! I've seen many m3's on the dyno gain numbers. Let alone all the people Ive met at car meets here with m5's, m6's, cayman s, sl 63 that have his tune and feel the power gain. I just felt that the 335i example was the best one to share.
2008 Alpine White e93 335i- Sold
2009 Black Sap. Met. e93 335i- Sold
2010 Melbourne Red e92 M3- Sold