I am fixin to put me a MagnaFlow exhaust & a K&N FIPK kit on my 2011 JK. Between the two, I should gain almost 19 HP along with 12 ft lbs of torque. My question is this, Should I gain on milage also since I will have better flow and less back psi? And, will installing the MagnaFlow void my warranty on the drivetrain? I am hearing different stories and figure y'all would know the answers.OOOOPPPPSSSSS.....It's EXHAUST....lmao

 

you wont gain mpg or noticable hp. skip these if you're trying to go after power and regear your jeep.

anything you do to your JK can discontinue your warranty with jeep. all they have to do is point the finger.

 

I put on a K&N CAI and used a Diablo sport programmer and gained 10 horse and 20 torque on the dyno at Finish Line Performance. this was with an 87 octane tune. I'm running a few tanks to see the gas mileage and then I will try the 89 octane tune (the Diablo has a 93 tune also). I feel the difference with throttle response and I can merge and pass much quicker. I want to try the 93 and get it dynoed again but I want to work up to it. (Also, the price of gas is supposed to go down after Memorial Day.)

 

Just my $.02 here, if I had it to do over again I would have bought a power programmer first (Diablo, Superchip, Bullydog, etc...). The exhaust and CAI only made me sound better (didn't do anything for actual power). I'm sure most guys that did exhaust and CAI first would agree