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2002 F55 STS, 2014 Explorer XLT, F-150s
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77,682 Posts
IF you're going to run without mufflers (cat and resonator only) you need to have a shop do a tasteful install of a pair of pipes and tips as original-looking as possible for 2 reasons: 1. Possible legal problems, and 2. VERY REAL possibility of carbon monoxide poisoning from exhaust gas under the car. (Too lengthy to discuss, but there are several ways exhaust gas can get back into the passenger compartment from under the trunk area.)

Be prepared for a very noisy, uncomfortable ride, especially at highway speed.

Without mufflers you might, just might set a downstream O2 sensor malfunction code which will fail any emissions test.
 

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Administrator
2002 F55 STS, 2014 Explorer XLT, F-150s
Joined
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77,682 Posts
You already have a high flow cat. An aftermarket "high flow" unit will almost certainly set emissions failure codes and "Check Engine" and "Service Engine Soon" messages.

Take a look at drop-in replacements at www.easterncatalytic.com
 
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