i had 260 hp on my stock 99GT i added BBK longtubes BBK catalytic H and a flowmaster Catback, i do not know around how much hp my car has now but im guessing its over 300, but i was talking to this guy about my car and he said that possibly i could be loosing hp due to not having an Cold air intake or aftermarket TB he said i am either loosing hp or not gaining the most out of my headers etc. is this true and BTW about how much do you think my car possibly has due to the fact that there are no DYNO shops near my area.