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The FMF Ti4 Spark Arrestor End Cap is a replacement endcap for the STOCK non-spark arrested endcap on the FMF Ti4 muffler. If you do not want to run the spark arrestor, than reinstall the stock endcap.
Unfortunately, this will not fit the stock exhaust, it will only fit the FMF TI4 muffler. The stock exhaust should already be spark arrested on your 2007 Arctic Cat 500 Automatic. If you need replacement parts for this specific model, please contact an authorized Arctic Cat dealer.