I've made a few upgrades to my 2013 G37x and would appreciate any info from those savvy on the situation I am currently experiencing. The upgrades that I've done that needs attention is the Stillen supercharger, the cat back exhaust. and the new service engine soon light that states my car requires replacing the catalytic converters. Car has less than 80k miles on it and was running reasonably well until the light came on. My mechanic has done multiple runs with diagnostic scanner and it as come back with catalytic converters being less than adequate and it has on occasion indicated random misfiring. I've purchased Magnaflow universal fit converters as opposed to the direct fit due to the huge price point difference between the two. Direct fit running above $600. per converter while the universal fit being a little over $200. Summit racing rep said the universal fit will properly. I'm sure I am not breaking new ground her so if anyone can shed some light on the subject please feel free to help a fellow G enthusiast. BTW, I can hardly wait for this car to get completely dialed.

 

Cats likely plugging up. Don’t drive too hard until you get this sorted, last thing you wanna do is suck the crap back into the engine. Should be a simple weld job to the pipes, shouldn’t be too crazy.

 

Thanks Boss, the situation is not going well in that the universal fit cat/conv really doesn't fit properly. It's really a two stage appearing converter which has a bend midway through the piece and is roughly 19" whereas the universal converter is 11" which take the converter well past the comfort point for ground clearance. Furthermore, Magnaflow appears to be the only company offering the aftermarket converter that is California smog compliant. It gets better: I can only find one converter for my car and that is passenger side. Seems Magnaflow will not be manufacturing the driver side converter until mid-March. What a completely messed up state California has become. Makes me want to vomit. Good intentions from misguided fools have made life very difficult in certain areas, but that is a different subject altogether.