Do you really think a cheap higher threshold regulator is a choice modification!? HAHA! Oh dear. Complete and utter rubbish. Something clueless people used to tack onto xr3is and the like back in the day. Think about it, you're messing about with the pressure within the rail by the crudest of means. Absolute junk. Plus if you were tuning your N/A engine properly, you'd want to be running leaner! Not richer! Haha. Just leave garbage like this alone and ivest in some real modifications, not mickey mouse efforts.