Two items: New catted H-pipe break-in. Speedo/Odo broke.

Just changed out my H-pipe for a catted one (emissions), I feel a pretty big difference in response and power, is this normal? The whole car feels different, a little more engine noise it seems, is that just because the air isn't exiting as fast anymore? Also is there a break-in period so to speak with new cats?

Another issue, my speedo and odometer just quite working, was fine on the way to work and now at lunch its broke. Where is the wire or whatever for that located. Repair suggestions please.

Thanks.

It actually had an O/R H-pipe on it and I had to replace with the catted one. But now after passing emissions just today I think I'll put the H-pipe back on as like I said now I have a ton more engine noise, it's weird. Plus to go along with that it really seems to labor as I think we really messed something up with the clutch, it sounds bad, sometimes almost a grinding sound when the pedal is out, not always though. And when I let the pedal out slow it sounds really rough. Could we have messed that up, I'm thinking while trying to pry the driver side of the pipe in one time we moved the trans and messed up some sort of alignment? It ran just awesome until we installed the H. Now my 58K mile baby sounds and runs like crap (well not that bad, but definitely different). Does any of this make sense?