Yes it will make a difference. I not sure how much without a dyno reading. My last car I had made 220 hp to the wheels. With a Magnaflow exhaust only the engine produced 233hp to the wheels. I think I made 21 pounds more of torque too. When I added The CAI I gained Some more. But I dont...
Test drive first . I am happy with my FJ so far. I had a Golf and its a big change. Just like anything you get used to it. The reason I changed is I wanted something with more room and something that would kick butt off-road. I hope that helps .