RPIpower

I guess it depends on who or where you are reading this information. If it didnt do anything, I wouldnt have made it, spent thousands filing a patent for it and most of all, other companies would not have copied me

tnycman

If you do a google search you;ll find many opinions about it.. If its adds 15hp that's worth the money.. I will consider buying one myself down the road..

RPIpower

Youll always find opinions about it. Ive read so many different things that I dont let them bother me anymore. There are always biased opinions about things anways. You choose who you want to believe.

tnycman

I wasn't trying to discredit your product, as I didn't test it myself, and if I gave you that impression I'm sorry.
I'm not here to trash any products, just to learn more about my beloved BMW.

However, a before and after dyno test will be a solid prof..

John@Motorcepts

It doesnt give any HP gains at 10 mph. It gives you gains when there's sufficient air flow which is VERY important for BMWs.

This M5 hitted every RPi's MAXIMUM claimed hp!! Where do you see any performance tuner out there which allows you to hit all MAX claimed hp? Ur lucky to get over the minimum

phelix

The dyno should already be correcting for the ambient temp, air pressure and humidity. Any chance you can post those figures; they're usually at the bottom of the printout.