[mustang_gtr_99]

You are both right in a way. If you have the INTERCOOLED 2.1 you can up the boost and go well over 400 but you will need the forged rotating assembaly. However, the normal boost preasure that comes standard with the kit is 9 PSI. 9 PSI is fine for the stock 2V and thats why KB made it that way. The 2.1 is right there in the midle which is cool. Kb made it so you can keep it within the stock limits and offer a lot more boost potential for the people with a built bottom end

 

[mustang_gtr_99]

around 400 rwhp

 

[mustang_gtr_99]

Assuming your car is stock you should have in the neighborhood of 380-405 hp. Look for 400-410 if you have CAI and catback. The kit is designed to start with the stock engine however, the boost range is from 6-14 PSI which means you will exeed your stock bottom end quickly with any other mods. I recomend the kit, just keep it at 9 PSI till you are forged.

 

[mustang_gtr_99]

I have 9.5:1