Catalytic converter for my 2k3 maxima? I want the best Catalytic!!!

 

Warpspeed test-pipe!! The 2k2 and 2k3 cats are well designed and provide decent flow. I wouldn't waste the money on a new converter.

 

All these so called high flow converters are the same honeycomb substrate you have on there stock. Only thing is they scrimp on the platinum so they don't clean the air as well. As for higher flowing cats the only ones that are better flowing are the mega expensive Metal cats. They use a metal substrate instead of ceramic. They are only made by one company called Emitec. german company. I experimented with them a few years ago but they were so pricey no one would pay what it woudl cost to make a high flow cat that works. Apexi has released them now and they have broght price down below $500 which is good but a poor value when you consider than a test pipe will give you even better gains at 1/5th the cost.

 

I bought a metallic substrate converter from Warpspeed for less than $200.00.

 

I wouldn't put the money in a cat. Rather get a y-pipe when it comes out for the 03. I think warpspeed has one available. Didn't someone dyno it and show minimal gains?? I'm not sure....just thought I saw that somewhere.

 

The Warpspeed pipe goes up TO the cat...not in its place.

 

I have a y-pipe!!!

 

The OEM cat flows VERY well already. About the only thing that would flow better is a test pipe.