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Pro Circuit exhaust question

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I was recently fortunate enough to win the Pro Circuit T4 exhaust package from the RacerX--Team199.com giveaway.

My question is, will I have to re-jet for this system like I always had to do with my two strokes? I have an 03' CRF450 with completely stock jetting and I mostly ride tracks/desert in Phoenix, or out at Glamis (so pretty much sea-level)

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It should be fine with stock jets where you ride, but you will more than likley have to open the pilot screw 1/2 turn if it pops on deceleration

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I've got an '03 CRF 450 w/stock jetting and full titanium T-4 setup and the bike starts and runs great. While I think the bike may be running a tad leaner, it doesn't pop and runs great from sea level (dunes) to 8000 ft here in the mountains around Prescott.

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