Originally Posted by lscrx
A cat-back exhaust will not affect the cars fuel economy, if anything it'll improve it. A less restrictive (ie louder) exhaust will give a small boost in power, and the engine will have to work less to match the stock performance... unless the new exhaust makes the driver use the skinny pedal more because they enjoy the aural qualities of their modification.
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thanks,, any opinions on voiding warranty for exhaust/engine related issues when installing aftermarket mufflers?