header question

bike is a 99wr400 right now it has a t4 full exhaust guy the i bought it from also gave me a type 496 scilencer Slip on does not fit in the t4 head pipe. what are my options for head pipes with the 496 other than stock ? is there a noticeable power diffrence with a aftermarket head pipe?over stock the t4 sounds sweet but just to dam loud!! thanks in advance

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