Hey dont punch the cat. Your going to create Flow Stagnation which is an interuption of the exhaust gas velocity. the cat will act like a hollow box which is bad. People do that thinking its good but really its bad. About turboing the motor its all about tuning and how your fuel management is. Id suggest getting a more powerful fuel pump some dsm 450cc injectors and a SAFC and then getting the sucker tuned professionaly. And if your own a budget look at teh dsm turbo manifolds. I cant remember which Eclipse it is but one generation fits the accord head almost lke a glove. Its a easy way to get a turbo mani.