Although the actual intake is 2.25, that's not the flow size of these mufflers - the 2.25 intake goes down to 1.25 in the muffler. It's the same as using a tap on your 2.25 to 1.25 pipe and then installing a 1.25 intake muffler, which is not recommended for any vehicle - your car has a 2.25 for this reason -Pipe size because the flow is so good. as the smallest member.