Improving my towing situation would be the only reason I would consider modifying the engine. I feel like gears are the first logical, safest and least invasive step. I also feel like once I go that far the Harrop will be the icing on the cake that I just couldn’t resist.Nor did I. I do tow with mine a fair bit and with the mountain passes the added torque is a nice benefit. I didn’t add to make it “fast” but it definitely has helped with towing.