Steve from Imagine auto helped out. Finally, the Cat Simulators will be at my house by 10:00am. My car will be running a great deal leaner and I will be able gain the HP lost b/c of the hollow cats.
Also, my car goes in for the upgrade this week, hopefully get the 500HP to the rear wheels range that I have been striving to achieve.
The next big question, will upgrade to EVO Stage 4GT work well with the "sims" or will I have to go back to the 100 cell cats?

My Car dynoed at 476 rwhp a week ago with
K24
Evo stage 4

What do you think with the new upgrade?
Garrett K24
Evo stage 4 GT

Will I break the 500HP rwhp range??

 

I should hope so! The 2 Stage IVs that I know of are just over 500 WHP...and that's at all 4 wheels!

Good luck!