they do make AWD dyno's you know. The dynopac system is very good. It can add load and everything to get very accurate results. These company's shouldn't claim certain gains unless they can back it up. Most of them will like it VW and Audi's cases I sent GIAC an email requesting dyno and timing plots and A/F ratios plotted in the complete RPM range till redline and Garrett Himself emailed them to me. Most reputable company's should do that.

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2002 X5 4.4i Sports package