I was curious on what the pair valve does. I've seen a lot of different people talking about removing the pair valve. This is a mod usually done with an aftermarket exhaust, right?
Actually, I think I was the source (at least on this site) for this bad information. According to cache, who knows TONS more about the busa than I do, the PAIR valve pulls CLEAN air FROM the airbox and injects it into the exhaust to reduce emissions.Re-circulates spent exhaust gases. Removing it simply does away with the what the Government wants your syatem to do regarding emisions.
Yes, to your last Q. One of two options; either blocking or utilizing the pump as a 'Sucker Mod', routing the pump to the crankcase, ie., pulling the pistons along in, creating negative pressure, thus (theroratically) easing the travel/work. <Nutshell description