Its not about the losing 5 hp or whatever, your gonna lose low-end torque (which you have very little to spare) and change the way the motor runs and works the transmission. Meaning your gonna overwork your tranny trying to keep up with traffic.

Go 2" all the way back , remove the resonator and premuffler (if you have it) and put a single magnaflow street series with tip muffler on there...

 

personally, i like the look of a single tip better than a dual, but thats just my opinion. all problems are solved if you get the GReddy SP2!