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Hi All, I am a new owner of a slightly modified 2003tt and love it. I bought it about 2 months ago and just last month the check engine light came on. I went and bought the durametric entusiast cable (which I read about here - thanks to everyone) and read a p1145. I watched the o2 sensors while the car was running and they seem good (voltage fluctuating and both bank 1 and bank 2 seem to have simular readings.) I did notice the sensors after the cat have spacers. (PPI didn't state that and I didn't know a thing about it until reading forums). Anyway a long story short I was reading the maintenance records of the car and noticed one mentioned a small crack in the aftermarket header (oh yeah techart headers and exhaust and I believe k24 turbos and GIAC flashed) - anyway I looked and in the collector of the bank 1 header it looked like a small black line which I assumed might be the crack. Would a crack in the header cause a P1145? Any other good checks? Car seems to run fine but rich at startup. Lots of power. Any help would be great! Thanks all!
Did several searches and could not find the answer if both the headers and cats can be swapped going from 3.6l to a 3.4l. For thread completeness, there several threads noting that you can put 3.6 mufflers on a 3.4, connecting to 3.4l cats. I use bypass pipes so mufflers are not part of my equation. My goal is to buy a used second set of catalytic converters to be modified with new 200 cell guts, but keep the stock parts just in case I want to revert back to fully stock in the future or have trouble at visual inspection. There seem to be more 2002+ exhaust parts available and came across a 2003 set but I have a '99. 1. Do 3.6l cats bolt onto 3.4 headers without any mods required (no need for 3.6l headers)? 2. If I replace both the headers and cats from a 3.6l onto my 3.4l, will they bolt right on and all brackets fit without any mods? 3. If I have to do a swap back to the original 3.4l cats with 3.6l headers on, would they fit on the headers, or would I have to put the original 3.4l headers back on to get them to fit? For reference, I pulled part numbers for both cats and headers: Catalytic Converters: 3.4l [M96.01/.02/.04] ('98-'99 / -'99 -> '00 -> '01-) 3.4l LEFT 996-113-021-53 / 996-113-021-56 -> 996-113-031-01 -> 996-113-031-02 3.4l RIGHT 996-113-022-53 / 996-113-022-56 -> 996-113-032-01 -> 996-113-032-02 3.6l [M96.03] (2002-2005) 3.6l LEFT 996-113-031-03 3.6l RIGHT 996-113-032-03 Exhaust Manifold/Headers: 3.4l [M96.01/.02/.04] ('98-'01) 3.4l LEFT (1998-2001) 3.4l RIGHT (1998-2001) 996-111-101-52 996-111-102-52 3.6l [M96.03] (2002-2005) 3.6l LEFT 3.6l RIGHT 996-111-101-53 996-111-102-53 X51 3.6l LEFT 3.6l RIGHT 996-111-101-40 996-111-102-40 edit: Simplified part # section and added color