I did the MOD to the STOCK air intake, The ONLY difference I have, is MORE INTAKE NOISE!!!!!!!! I have been Modifying cars,trucks for 35yrs. and RARELY does someone REALLY see an improvement in an Aftermarket intake or exhaust system!!!!! There are two possible reasons for this, 1. The products FLAT DONT DO WHAT THEY CLAIM!!! or, 2. The Performance or fuel economy is SO SLIGHT that when YOU drive around, you have your FOOT IN IT more often and the fuel mileage goes all to Hell!!! One last Possibility is that after spending 5-6-700 Hundred HARD EARNED DOLLARS, NO ONE wants to admit that THEY have thrown away so much and gotten SO LITTLE!!!!!! I REALLY WISH that someone would do an INDEPENDENT DYNO TEST!!!! ( the manufacturer testing is way to easy to munipulate!!!!
