normally I would ask about cars and their exhaust else where but I figure ya'll know more about this exhaust. Most headers come in a 4-2-1 type setup The reading that I have done seems to leave me with 10-15 less HP (I haven't read too much) assuming that it is a 4-2-1 now if I run a 2-2-1 or a 2-1-1 will I still lose HP If anyone is asking why its not the sound produced Its mainly because I wanna take my dad down a 1/4 mile If you can help or have suggestions im all ears.