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!!!!

 

Free bump i got the same issue and think its coming from the dp/catback flange

 

I get a rasp at WOT with my badmab, zzp dp and stock catback like explained above.

Putting on my zzp catback today hopefully that all goes away

 

Put some copper gasket spray between any gaskets left.

 

Oh yeah that did it for you right? vband too?

 

Well i have that flange literally welded up!!!! So that's not the issue. and a copper gasket was put on the header. ***** tweaking me out lol I just want to figure it out.

 

The SCE one? Lots of complaints those leak.

 

sorry to comment on my old forum, but yes that one… you've heard a lot of complaints with it? i just had the car checked out by my mechanic and he couldnt find any leaks. He said either their is a vacuum leak elsewhere or it is leaking nearer the header.. any suggestions? or should i replace the gasket?