99 wr400 exhaust questions

picked up a 99 wr400 bike came with a full t4 exhaust though loving the deep growel of the exhaust its just to dam loud previous owner also gave me a procircuit type 496 NEW in box but does not fit the t4 head pipe? im guessing its a slip on not wanting to lose power what headpipe do i need for the 496 is it worth the $$ for a aftermarket headpipe or is the stock one good thanks in advance Oh ya new to the site and love it!!

I'd shoot an email to ProCircuit they have excellent customer service and should be able to answer your question with ease.

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