what one adds more.. FMF megabomb header vs stock header? or FMF q4.1 can vs stock can? I want to compare your guys answer versus those of my local shop. they said the 09 has a very restrictive exhaust. so if you replace the stock exhaust you will notice a huge difference.. so my buddy forked out the 600$ for so for the FMF q4.1 can... is that true? they said that the changing to a megabomb header is a waste of money/insignificant.. is that true? theyre basically saying that changing the can is more effective than the header... I always thought it was the opposide way around? the header did everthing and the can barely did anything? thanks.