If you go with an off road pipe, I would get gears too. You will loose some torque down low, but gears will make up for that. Its not a huge loss but it is noticeable. You will loose less with a off road h pipe than an off road x pipe. X pipes flow better but you loose lots of back pressure which = torque loss. Dont let anyone tell you different I know I have done it. I do love the sound of the off road h pipe and would not go back. Just expect a little torque loss. You probably do gain hp up top at higher speeds and higher rpm's. The car just drives a little different after the install. You can get gears at Gene Evans ford for $139 and they are frpp. That is a good price. I say go with off road h pipe.