they suck for peak power. They make decent midrange power, but for PEAK numbers they have had shitty results when compared to AEM NON V2, Injen, etc. I gained 3 whp by switching to a NOPI #1 intake pipe over the PWJDM. They are cool looking an have that JDM appeal, but power wise, they arent that great

the best intake is a pipe with a velocity stack

/thread