How bad is the smell with O/R pipes and hiflow cats?
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I personally like the smell of my o/r setup. Reminds me of when I used to ride dirt bikes. In traffic, you can smell it, but it's not to bad. I say go o/r or go home. Catted is not obnoxious enough!! 
Sent from my Galaxy Nexus
Sent from my Galaxy Nexus
I'd either leave the stock state-of-the-art high-flow cats alone, or take 'em out. Keep in mind, removing them is a) highly illegal, and b) will make the car run badly unless the computer is 'tuned', equalling more $$ spent. Seriously, the OE cats are pretty much the best ones you'll find for the car.
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Mine is untuned at the moment and I actually got a got a gain from the o/r x. So that is not always true.
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Technically, yes. You won't get any arugment from me. But frankly, neither is 120 in a 65 and how many times do people post about it over a week's span?
Not necessarily true. The Coyote has front wideband O2 sensors that can compensate for anything going on that's not exactly right. But it's by no means a fool proof system and I think most of us would still recommend getting it tuned.
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Unless you're running long tube headers, absolutely not. Magnaflow's high flow catted X pipe that connects to the OEM headers is around $800 USD on the low low side. No thanks. That's a set of long tubes and another 300 - 500 (depending on what company you're using) the matching high flow catted mid pipe for a full long tube exhaust setup. If you don't want to go with long tubes, keep the OEM cats or just ditch em. And yes, off road mid pipes make the car smell pretty bad.
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