Megan Headers, Megan Y Pipe, Stock Catback, Joe-Z Intake Tube, K&N Drop In
Whatsup dudes, just wanted to throw a review in the archives to maybe help someone later. I installed the Megan y pipe 3 years ago to replace busted and rusted stock Y from PO. Earlier this month I drove from Florida to Colorado in one sitting and back in almost one sitting and during the trip the manifold cats finally clogged enough that I needed to do something (diagnosed with IR temp gun precat 360 degrees and post cat 150 degrees) and as much as I'd like to get a set of Figs or Dezod it would ultimately be a waste since I'm not planning on staying NA 2jz and I found a set of Megan headers locally for $40... and my ae86 needs coilovers and a BEAM's swap... and I'm cash poor.
Anyway, removal went as expected, a few expletives getting the third cat's heat shield off (a must if you plan on removing through the top, I only removed the intake tube, nothing else and they came out "fine").
Install started off as a PITFA because the bolt holes on the Megan were too close together and wouldn't line up so I used a step drill to widen the holes and after some harsh words the headers accepted their fate. I reused both oem header gaskets and the flange gasket (which was pretty worn out but I couldn't source one local so I'll expect a blown flange gasket while I wait on one in the mail), I used some red rtv on the flange gasket to hopefully keep it together longer.
Y-Pipe on stock manifold and stock cat back sounded a little deeper and throatier, but not much. The Joe-Z could be heard over the exhaust until after 4500 or so.
Full set with stock catback sounds close to stock at idle and up to 3500 but comes alive at WOT, especially after 4500. Seat of the pants feels much faster but anything would have been faster than clogged cats. In cabin sound is louder on WOT but almost unnoticeable on regular throttle. Joe-Z is loud at lower RPM and the exhaust takes over the higher RPM range.
I had heard that I would lose power in the low end with the megan due to copycat r&d and scavenging but it's feeling much better than it was. Overall I'm happy with it, quiet regular driving and spirited on WOT, just what I wanted.
I hope this is helpful, this site has saved me many times and I hope I can eventually pay the community back.