Here at RP we make a solid 480HP & 498TQ on this bolt on set up without our tune. Where you feel and see the differences in the LF4 is where the power comes in and where it ends. The curvature of HP and TQ lines will change drastically as you balance the induction banks and delete the catalysts. In the recent months a few customers have been running these parts with out a tune and made very good horse power numbers. Some cars run CEL lights some do not. We DO NOT recommend you to run with out a tune. But it is being done and many buy parts from RP for this reason. with a tune this kit will be around 500HP.
Disclamer: RP does not build kits for the highest numbers. We develop tunes, hard parts and packages with in a series of goals. Where you will see and feel power differences the most between each stage, is when power comes on, when and how long it lasts.
1. Reliability and Longevity. Because if you car doesn't run, its useless and expensive.
2. Power delivery, linearity and delivery.
3. Installation and OEM fitment of all parts.
Support: You can call and text James Renick direct for installation and questions anytime at (714) 345-5926