Those of you that are into modding, tuning and car experiments, you will come to appreciate this article. Jonah, a reader of our online magazine, has decided to upgrade the turbos in his 335xi.

My car (08′ 335xi) is currently under the knife having the first set of TiAL Sport upgraded turbos installed. I will essentially be the first customer car with upgraded turbos who is actually vocal and talks about what is going on (compared to say the ASR upgrade which supposedly has sold 10 times but no one has ever mentioned a word about them). The upgrade consists of a custom compressor and clipped turbine.

Here are the results from my initial test day. Remember this is an AWD Mustang Dyno, so the numbers are smaller than most people are used to seeing.

For comparable numbers to a typical dynojet, add 12% to what you see here. Everything you see here was done on Shell 93 octane pump gas.

Take note: The baseline you see on this graph is roughly ~20whp more than what would have been observed had I not had a completely catless exhaust + upgraded FMIC + intakes.

Peak gains: 40awhp/50awtq on pump gas alone

Baseline (w/ catless exhaust/fmic/intakes): 256awhp / 289awtq

Stage 3+ Stock turbos: 345awhp / 392awtq

Upgraded turbos: 386awhp / 443awtq