Quote:
Originally Posted by Karura
Another question comes to mind.
Let's say I want to be responsible, environmentally friendly, and health conscious.
Would the secondary cats be able to do as good of a job at filtering the emissions/noise as primary race cats in a set of aftermarket downpipes?
To rephrase: Wouldn't going catted DP and catless midpipes be less noise/smell/emissions than catless DP + OEM catted midpipes?
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There is very little smell to no smell with catless downpipes and stock secondaries once they are warmed up. Neither of the two options will pass smog (in California, at least). It is hard to say which option is actually more harmful to the environment, but as previously mentioned, it's probably about the same.