Of those choices I would run the 9901/41021 unless you have a Mugen then run the 9901/41029. The 9886 is comes on like an on/off switch & the 9853 is not as smooth on the bottom so it would have problems in loose conditions. The 41001 is not as smooth in its power delivery and develops more torque so I would not recommend it over the other two headers. If you don't mind buying another pipe the 2096/41021 or 2096/41029 combos would be the optimum setup for that engine in those conditions.