2002 corvette 2003 cobra or evo?

I have a 2002 c5 2 owner car with kooks longtubes offroad xpipe and b and b bullet exhaust, intake dyno tuned it has 78k miles on it 6 speed it seems like it might start having problems is my daily driver i like it because of appeal and fun factor but seems like it has lost a lot of power since mods were put on last yearish, have been a mustang fan esp terminator aka 2003/2004 cobra i know they are fast and moddable and i like the mitsubishi evos 2003-2005ish not the brand new ones there are a few of these for sale in my area I want racing power sound and pick up *** car like the vette whats my best bet? Buy one of those ?keep up vette? or trade in for another c5 with lower miles? Thanks