I have a 4G69 Outlander which only has 1 cat. These are a fraction more powerful than the Lancer versions in stock trim..
The cam is fine as it is if not a bit too aggressive.... that's right! The hi speed intake lobes are equivalent to a typical stage 2 cam and the exhaust lobes are somewhere between a stage 1 and stage 2 cam. The only cam problem is the low speed intake lobes are a bit on the sad side with one set of lobes having less lift than the other to "encourage a swirl effect" so marketing can make a big deal about this "Cyclone" technology. Nobody does this type of stuff anymore because everybody know knows that a 4 valve head uses tumble, not swirl to get a homogeneous fuel/air mix.
The problem with the generous high speed cam specs is that it crashes the dynamic compression ratio of the engine - the sad 9.5:1 CR is way to low to run 272 intake/ 256 exhaust cam durations. I shaved my head 23 thou (absolute maximum possible) to boost the CR to around 9.8:1 to combat this but really needs something over 10.5:1 to get the best out of it. I took the opportunity to sharpen up the port dividers in the head while it was apart as one set of valve has a partially obscured look at the manifold runners in line with the misplaced "cyclone" theory.
So on the Outy, the headers are a good 4-2-1 design - no reason to change. The 60mm throttle and airbox etc. is perfectly fine too.
The stock tune is pretty horrible - I have reflashed mine multiple times to develop a decent tune for power and economy. The Outy is a heavy vehicle and the fulltime AWD and auto box takes its toll on fuel economy but now it can put a little smile on my face from time to time. That is saying a lot since I came from a 220HP 4B12 CJ Lancer before this
The 4G69 is a walk in the park to flash tune compared to the later 4B1x engines.... no fighting with a bastard dual VVT system!
Before you head off looking to lighten your wallet, these are the stock cam specs:
Opens Closes Duration Lift Center
Intake Lo 10 BTDC 42 ABDC 232 4.094 106
Intake Mid 12 BTDC 44 ABDC 236 9.344 106
Intake Hi 24 BTDC 68 ABDC 272 10.3854 112
Exhaust 58 BBDC 18 ATDC 256 9.9266 110
*Intake Lo is for 4 valves and Mid for the other 4. Intake Hi kicks in around 3500rpm and the exhaust remains on the same lobes all of the time.