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Originally Posted by Intel55
I have never done it on a x5, but you should be able to do it no problem, just keep it under 100. 
Easiest way would be a dry kit, the nos 75 shot. The wet kit would require you tapping into the fuel rail. If you get an obd ii reader that would make things all the better. I would also go with colder plugs. I am not sure what the next step down in colder plugs would be for the bmw. You could also put in an exhaust temp gauge to shut you down if you go to lean.
For looks you could run two purge lines, each shooting out the top girlls. |
I have ran up to a 200 dry shot in my cobra that is for sale on ebay. I just figured that a wet shot would avoid any problems with the computer trying to tune itself (I don't know anything about these mass air flow sensors, I know the one on my car was a finicky little bastard, so the DRY shot was done post maf, and I had the car tuned extra rich). I would also get a wideband 02 setup (like I have on my other car), and yes colder plugs would definately go in.