No chip should backfire. So you probably need to do some basic troubleshooting.
Fuel pump? Wastegate hoses? Boost Gauge? Spark plug wires? do you have a stock chip you can put back in for testing?
I agree that the Hypertech is stone-age compared to todays stuff for these cars. So plan on an upgrade there.
Post some more info on the car, pics, we can help you thru the troubleshooting.
Bob