People can say it doesn't add any power but it does from 5500k to red line. The car feels like it can breathe better. Obviously the PE doesn't add 20-30 whp but the power difference is noticeable. I didn't buy my PE for the performance though, I bought it for the sound. I bought my DP's for performance. I bought my PE used for $800 off a member on here so as long as you find a good deal I think the PE is well worth it.