Join Date: Jul 2004
Location: Fresno, CA, USA
Sort of Frank, The only thing the AIS(Air Injection System) does is pump fresh air into the exhaust just after the exhaust valves. This allows any unburned fuel leftover from the combustion process to mix with the fresh air and burn in the pipe. the stock pipe has enough baffling so you don't really hear the backfiring, but with an aftermarket pipe you do. Installing block off plates stops the flow of fresh air into the exhaust and reduces the amount of 'afterburning' that occurs in the exhaust pipe.
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