Just had the car on the dino this week to check out what the Boss 302 manifold did to the HP and TQ. HP went from 387 to 410 and TQ went from 367 to 345, but added gobs of TQ below 3000 RPM. He also added a ghost cam affect that really turns heads. The next day to Gainsville Raceway for test and tune, 12.70 @ 114 that bettered lasy year by .22 seconds. I think that's pretty good for an automatic with 3.15 gears and stock PZero's..

 

Not bad. Those numbers seem to have made a very large jump.
I take it the first time you measured output, your car was completely stock.
Is this Dino the same dyno guy you used last year?
Also, did you dyno the car in the summer last year and re-dyno it just recently in the cool air?
These are some additional factors that could have given you a very wide variance.

 

Are you using the stock airbox or running an aftermarket CAI?

Also, I notice you lost Torque but you say you have gobs below 3K RPM. Most guys running boss intakes say they lose low-midrange TQ. Do you have a dyno sheet?

 

The first time it was tuned I had a Airaid CAI and Magnaflow exhaust (off road X-pipe) it was tuned the first of Dec here in FL and the temp was about 72 Deg F this tune was similar with a temp in the high 70's and low humidity. Same dyno and tech. We removed the Airraid restrictor for this tune as well.

 

The torque peeked at about 4,300 RPM it picked up well below 4,000 RPM compaired with the previous run and yes I have the dyno sheet.

 

My bone stock max torque was 348lb ft and 363 RWHP that was last July 2010 with the CAI and Magnaflow mufflers.