High Flow Cat

[Jovian2k]

I will be using a 2.5" downpipe for my BP Turbo project and currently don't have a high flow cat to match up to it - I have the stock MX-3 Cat. I have been thinking of options and am weighing three right now:

1. Bolt-on eBay Catalytic Converter
2. Universal 2.5" Catalytic Converter (Flowmaster, Magnaflow, etc.)
3. Keep stock MX-3 Cat

I know people say the eBay version sucks but my question is: How can they advertise this as a catalytic converter if it has no internal catalytic converter properties? People compare these to test pipes which are also available on eBay but I don't get why a company would falsely advertise... has anyone purchased the eBay one? I am curious.

I know I will need to have my downpipe welded to meet up with my exhaust and wouldn't mind also buying a universal cat from the above stated companies and have that welded in also I just know exhaust shops near me will screw me the more work I have them do.

[Daninski]

I have a magnaflow HF cat and it seems to work fine. I would suggest name brand cat so your sure it has been proven to pass emissions.

[Nd4SpdSe]

The quality of the catalytic converter is relative to the amount of platinum contained in them. People have reported that even the Magnaflows are only good for a year or two.

[Jovian2k]

Wonder if I am better off keeping my stock Cat for now? Only issue is the restrictive diameter (since I believe stock RS exhaust diameter is 1 7/8"). I am only running GTX VJ20 with GTX injectors and ECU so maybe it won't be a huge issue?

[mazdamx3bds]

I would suggest that you get the Magnaflow high flow cat, I ran one of those for a few years before I decided to remove the cat completely due to no emissions laws where I am.