Just bought a 2002 Z28 and it’s has a tsp 228r, 1 7/8 tsp long tube, ory, Circle D 3000-3200 11in cheaper converter, slp loud mouth 2. The Dyno results were only 355 wrhp. Doesn’t that seem low. It’s my first LS car but I figured it would be somewhere around 370 or more. Also it has the k&n intake system and I was going to switch it over to a lid. I wouldn’t think it would make to much of a difference with the tune to effect anything right?

 

Dyno numbers are something not to worry about in a stalled auto.

Trap speeds will tell ya what ya want.
So if ya have a track take it there and see what it runs.

 

considering that car would probably pull 280-290ish stock, i think that's a decent number.