Catalytic Converters, Hi Flow or Oem Cat?
#4
Evolving Member
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I got a hi flow cat and passed emissions no problem. What you should be worried about is the visual inspection, some inspectors can be aholes, luckily the one that did my car was very laid back. He asked about my Samco tube with Perrin filter but let it slide, then he asked about my flat back intercooler pipping and I just said it's a factory turbo car and showed him the small reference table on the hood that shows it. I can't remember what the values were but they were close to the average CA readings.
Last edited by edsct9a; Nov 25, 2013 at 12:26 PM.
#6
Evolved Member
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I say for smog put on an oem cat, then you can do whatever you wish. The oem cat is huge, so I cant imagine it being that restrictive anyhow, unless your pushing a ton of boost or are making close to 400 or more hp. If you just have bolt ons, then I say just leave the stock cat on there.
Out here cops like to pull you over for anything, another reason Im going with a quieter exhaust.
Out here cops like to pull you over for anything, another reason Im going with a quieter exhaust.
#7
When I bought my car it had a test pipe and it was tuned for that - car has basic bolt-ons no extreme power levels. I put the factory cat back on - no retune - as I needed emission compliance. Power noticeably decreased and turbo surge increased. Since then I have put a 100 cell milspec cat on. Power levels came back up - again no retune - I can't really tell much of a difference to the test pipe - and turbo surge decreased. All this suggest to me that the 2.5" stock cat is a choking point if you are running a 3" turbo back, even at moderate power levels.
I say for smog put on an oem cat, then you can do whatever you wish. The oem cat is huge, so I cant imagine it being that restrictive anyhow, unless your pushing a ton of boost or are making close to 400 or more hp. If you just have bolt ons, then I say just leave the stock cat on there.
Out here cops like to pull you over for anything, another reason Im going with a quieter exhaust.
Out here cops like to pull you over for anything, another reason Im going with a quieter exhaust.
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#8
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"Huge" converter doesn't always mean hi-flow...again tho, I've only heard nightmares about CA visual inspections. Adding the stock heatshields to an aftermarket pipe is a bit of effort but a great idea to prevent the need to swap parts just for an inspection every couple of years.
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