Aeromodder - In theory, a high flow can filter just as well. However, it has to be bigger to accomplish this. The more area it has exposed, the better it will filter, and given enough passages for exhaust to pass through (large enough size), it can be effective and flow well.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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