3inch down pipe into 2.5inch catback ? 2.0t b7 a4
I'm getting ready to put an exhaust on my car and my downpipe is larger than my catback, both are advertised as 2.5 inch but I believe the downpipe is more like 2.75". I can put them together with a welder, my question is should I be concerned about a power loss or some sort of flow issue ? The car is ready for stage 2 post the exhaust, once that is on I have the flashed ecu.
Thanks in advance