What is a good performance exhaust system for my 4runner?

i am putting a K&N performance air intake system on my 1997 toyota 4runner sr5. right now the engine is straight stock. same with the exhaust. if i throw that intake on there, will i need a performance exhaust system or just a header, or wht? someone give me their opinions for this please. and opinions for... show more i am putting a K&N performance air intake system on my 1997 toyota 4runner sr5. right now the engine is straight stock. same with the exhaust. if i throw that intake on there, will i need a performance exhaust system or just a header, or wht? someone give me their opinions for this please. and opinions for offroading parts are welcome too.
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