when my header comes in i am going to go have a pipe bent 2 1/2 inch all the way back form the header to remove the cat and resonator so basically i'll have header - straight pipe then my 5 zigen muffler - thats is - what do you you tihnk that will do for me? - i know it will be loud and smoggy - but what kind of dyno would i gain from this and should i do it??