I have a 2005 black v6 manual coupe. I recently just installed a K&N cai system and the magnaflow dual catback exhuast system (y pipe, magnapack mufflers). What kind of hp and torque gains can I expect? The car is all stock except those two mods, and it has the stock tune still and I don't plan on retuning it. I notice a pretty significant difference in power and aceleration, plus the exhuast sound also makes it seem like your going faster than you really are. My friend just got a manual 2004 gt, stock, I wanna know if id be able to keep up with him or not, my other friend is getting a gt between 95'-98' too, and im pretty confident my car could beat those year gts but idk about the 99s-04s.