ultimx, Does your crx have the shift light? If it does it is a 49 states Fed edition. Good start!!! your car does not need a bellypan. Look underneath from the rear. Does your car have A/C? If it does and you want to keep it that limits what can be done with a grille block. Getting your exhaust system all in a straight line is a good simple start. Then you can do a diffuser in the rear where the muffler is now. Oh yeah, I picked up almost 5 mpg with the skinny Sumitomo HTRT4 tires.
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