Im looking into getting some lower to mid range gains out of my 172.Im not expecting too much but I was wondering what the best direction would be to take.I was thinking of starting with manifold matching and then fitting a new exhaust.I've heard and read many different opinions on whether or not there are any real noticable gains or not.What would be the best exhaust to get?A 2 1/4" mandrel bent or a 2 1/2".Would it be worth getting a high flow cat or sticking with a stock one.I've heard that you can sometimes lose back pressure changing the exhaust and actually lose power if it is'nt done properly.Would it be worth a chip to get the most out of the exhaust,and if so what would you guys reccomend.A group n ecu by someone like k-tec or a piggy back that be tuned live?Would greatly appreciate some feedback as I'm really unsure about which way to go,cheers.