Well, against advice, caution and reason I have added methanol injection and a 150 shot of nitrous to my X5 4.6 that already had Dinan cold air package, throttle body, air flow meter, stage 4 engine software,transmission software and free flow exhaust. I did decide to have Stett Performance, a local BMW specialist, do the install to eliminate some of the risk.

It was well worth it!!!! I am VERY pleased with performance!!! Launch is amazing with some tire spin and it just gets stronger and stronger through the gears. Will do dyno runs in the near future to document the gain with just methanol and then with nitrous boost. With methanol and nitrous I should get around 165 gain in HP and will have to see from dyno runs how much torque gain.

Control for the methanol injection is in the glove box as control is seldom used. Controls for the bottle heater and nitrous are in the center console where the CDs store. Methanol tank is in the right side panel in the back when the sub woofer used to be. Methanol pump is behind the trailer hitch cover plate. Nitrous bottle is exposed in the back cargo area unless the cargo cover is extended. Nitrous purges through vents in front of the windshield which are visible if you know what you are looking for under the hood. All else is pretty much hidden though stealth was not the goal. System is set up so that Nitrous won't fire unless there is appropriate methanol present. Methanol system is active on demand in daily driving. Demand can be adjusted with controller. Since methanol is there without the nitrous there should be some gain in mileage and performance without nitrous. So far it looks like I am getting about 2 more miles to a gallon though some of that cost reduction is lost due to cost of boost juice. Nitrous system is a NOS system. Methanol injection is from Snow performance. Engine sounds deeper under acceleration with or without Nitrous.

Will update when dyno runs are complete or if there are any problems that occur.

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas