I am planning on running my c43 stage 2 as I have new downpipes. I was wondering if the burgermotorsport tune JB4 is reliable?

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JB4 is extremely reliable, but if you did any research here, you'd find that it's not capable of eliminating the CEL you'll get with your new DPs, unless you have spacers or something like that to trick the sensors. JB4 is absolute best bang for your buck though. 55k miles, zero issues.

sorry to jump on someone else's thread but I plan on JB4 myself, I just did the bms intakes and I wanted to know if there is a catted downpipe that wont give me a cel without anything or if there's a set that comes with the needed spacers? Looking to be under $1300 if possible

unless you do spacers all changes in catalytic converters will risk CEL. also note that your engine is tuned for stock downpipes which means you will lose horsepower without a tune with new downpipes