Yes, we used a dyno for tuning but I never talk about HP/TQ results. I will say this--response to nitrous hit is instant. Very different than turbos and superchargers that are also more expensive mods. It's safe and tons of fun and easy to install. The looks I get when I purge the system are hilarious. No one expects an X5 to have nitrous.

No problems with original nitrous install. Just ordered the second Nitrous gauge for console a few days ago but I broke them they didn't fail. Since original install I have gone from one 10lb tank to two 15lb tanks. Added a second bottle opener and a switch to send power to either tank or both at the same time and have bottle blankets on both. No changes or problems with Snow meth system.

I just decided to spend another $5000 on the 4.6. Just ordered a scramble button for a second stage of nitrous. Will have to see on dyno how much I can add, could be as high as a 75 shot on top of the 150. Then comes timing chain job and head mods. I will be doing some engine appearance stuff when I have it apart. I have to replace the suspension airbags. I will finally install the 4.10 diff gears when I do the bags. I haven't had it out since last November, been driving my wife's X5M. I added a tune and modified the exhaust on the X5M so it is lots of fun. If I don't fall in love with the 4.6 again when this work is done it will be time to sell it. Right now odds are I will drive it for a few months after work is done and then sell it. A lot depends on the pandemic. If no car shows or meet and greets a lot of the fun is talking to other motor heads.

I don't like getting the bottles filled but that is only because I have to drive 30 miles to source and sit there for about an hour while the bottles are in a freezer getting cold enough so nitrous will transfer properly. And, I have to prepare to use it. Be sure the bottle is proper pressure, might need to heat it up. Open the bottle, purge the system, make sure there is meth in tank. On the plus side I can drive it without the nitrous and it's still fun and doesn't stress the engine.

I got caught just after I installed the nitrous doing 70 in a 35. One of those stoplight to stoplight encounters. Cop was a motor head. He looked it over, we talked about the mods and his car. He knocked it down to 10 over. I took the driving safety course so it didn't go on my record. Nothing since, that was 4-5 years ago. I don't do any top speed runs. Seldom over 110 unless on ramp is a long one.

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