okay I just put my header on and all the bolts arevery snug. When i started it up there was some smoke coming out atop the header. I don't think its a leak, but I figure since it doesnt smell like exhaust its just burning off that top layer of ceramic.

I went around town for a 5 min drive after i let it warm up....when i turned off the car there was that rattling sound. Could that collector plate ALREADY broke off for the 5-8 mins i was driving it? I'm letting it cool down again right now and will check that collector plate in about an hour or so.

btw i used brand new aluminum exh manifold gasket and a new white collector gasket. So that takes out any leaks from the gaskets.

if it IS the collector plate that came out, I'll probably just run the 4-1. I would probably get a dyno run with the DC being 4-1 so we can compare it with the original dc 4-2-1 setup. See how much torque i would lose if any. I guess i could expect similar #'s to the HP one. Only time will tell.

Oh and myeverlovinsir, when ur plate broke off, did it go down into the pipe that the CAT is connected to or was it just rattling around inside the collector? i hope my baby is alright.