Member Credit: THE PRESENCE, EddyMaxx & DeusExMaxima
Unboxing Cattman photos from Eddy.
This is a project that I will never forget. Actually, me and my mechanic had fun with the install.
This is why I had to purchase a set of Cattman Headers. The precat facing the front grille wasn’t so bad but definitely needed to be changed. Now, the precat facing the firewall was absolutely terrible. So terrible that the catalytic material completely jammed up my EGR valve pretty bad. Anyone that gets the SES light> P1402 code try your hardest not to ignore it. Below are some pics of the EGR valve taken apart and cleaned. Along with some of the bad catalytic cone material break-up.
This is all the crap that came out the Egr valve alone.
I had my mechanic weld a High Flow Cat on that I purchased from Advance Auto Parts. I’m just waiting to weld on the o2 sensor bung and extend that last o2 sensor wire. Instead welding the High Flow Cat onto the Racingline Y-Pipe. We just welded it on 6 to 7 inches further back.
Welding on the High Flow Cat
Additional Photos from DeusExMaxima
Original Pricing Below (This is for reference purpose only. Pricing is from 2010):
- Headers only, AT or MT version, no EGR port (07/08 Maximas) – $599.99 retail, $569.99 w/ org discount
- Headers only, AT or MT version, with EGR port (04-06 Maximas, 05/06 Altimas) – $629.99 retail, $598.49 w/ org discount
- Y-pipe only, AT or MT version, NO cat and NO “extra” O2 ports – $379.99 retail, $360.99 w/ org discount
- Y-pipe only, AT or MT version, WITH high-flow all-metal cat and NO “extra” O2 ports – $579.99 retail, $550.99 w/ org discount
- Y-pipe only, AT or MT version, WITH high-flow all-metal cat AND two O2 ports behind the cat – $599.99 retail, $569.99 w/ org discount
- Header/Y-pipe system, AT or MT version, NO cat or “extra” O2 sensors – $939.99 retail, $892.99 w/ org discount; add $29.99 for EGR port
- Header/Y-pipe system, AT or MT version, WITH high-flow all-metal cat and NO “extra” O2 ports – $1139.99 retail, $1082.99 w/ org discount; add $29.99 for EGR port
- Header/Y-pipe system, AT or MT version, WITH high-flow all-metal cat and TWO O2 ports behind the cat – $1159.99 retail, $1101.99 w/ org discount; add $29.99 for EGR port
Note from Cattman:
Because installation of the headers requires removing the precats, its necessary to make the secondary O2 sensors happy (because they monitor pre-cat function) to avoid related error codes. In a 2004 Maxima, this can be done with an O2 simulator or by installing a main cat in the y-pipe, followed by two O2 ports for the secondary sensors. This is not confirmed, but it “appears” that an O2 simulator will not fool the ECU in 2005 and later Maximas and Altimas, so installing a cat and two O2 ports in the Y-pipe may be necessary to avoid a CEL.
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