if i get aftermarket exhaust will my 5th/6th port valves still open up. becuase i know with exhuast you loos the backpressure and i was wondering if i loose too much will they still work? right now i have no exhaust... and when i mean no exhaust i mean i aint got a damn thing after the exhaust manifold.... for right now anyway till i get it back on the road. and i just cut the air pump line that used to go to the cat. conv. so its just hanin open. (i took off air pump and all that bull honky)