I have the following mods. Cattman y-pipe 3"testpipe megan racing 2.5' exhuast 17 degrees timing cattman pop-charger nwp bop and 5piece spacers. My car dynoed at 220 hp. Are these good gains for what i have done to the car. or should i be seeing a little more?

 

You can look in the dyno section there are LOTS of dynos you can compare against. Also depends on which dyno you used; some read higher some lower.

 

How do you fit a 2.5' exhaust under there? I figured 3" was about the most optimal.

To answer your question though, 220 sounds low for a 6spd.

 

 

Naw, its about right seeing he still have all the stock cats in the header manifold... This is why a y-pipe is so pointless for the 5.5... Its about right for the mods he has

 

I figured a 15% drivetrain loss would leave it at around 220whp stock.

 

get those precats gutted, gut the shelf out of the upper intake manifold, and dial in your mods with and air/fuel controller...240 would be your new number, at the lowest

 

Thanks for responding guys. And sorry for the typo 2.5" megan racing exhuast.

 

Type of dyno, AFR, syno graph?

You have any of that information?

 

without headers....that sounds about right

just buy aftermarket headers