Originally Posted by TopgunZ

It will cost you a little power and torque but you should also probably get it re-tuned because its going to go rich. Since you are at such a low psi I dont know how bad it will be but if you have an AFR gauge then just keep an eye on that to see if you require one. I am guessing you will. You will be adding a muffler to it which are the most restrictive components of an exhaust.