So i installed a ZZP long tube header/dp combo a few months ago on my 2006 LSJ…. Ever since installation i have had a raspy leaking noise coming from either below me, while driving, or it sounds like it is coming straight from the end of my exhaust ( i am also running a Vibrant catback exhaust) The noise is only heard when i reach about 4k rpm's or am creating any boost, id say anything more than 2 lbs. Has anyone else had this problem? Or any suggestions? I replaced header gasket with a copper gasket and new bolts throughout. I have also even gone to the extreme point of getting my header/dp flange welded (i absolutely hate v-band clamps). If anyone could help me it would be fantastic. I feel like the leak is making me lose power and it also sounds like complete S**T. My only idea left is that my flex joint is leaking… i took a look under the car for any resign build up but my car is undercoated so its a little difficult to tell. HELP PLEASE!!!!

 

this is the performance section not the my car is broke section that is called problems and service post your car is broke problems over there

take it to an exhaust shop get it on a lift and let them look at it

 

My bad… not too familiar with the network yet. Ill re-post on that discussion.