ISR Race Exhaust Catback - Hyundai Genesis Forum
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post #1 of 5 Old 04-01-2016 Thread Starter
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ISR Race Exhaust Catback

Just last weekend, I had my ISR straight through catback race exhaust installed on my 3.8 Genesis Coupe. I've been driving it around for about 5 days and I'm now experiencing some mpg issues. My average mpg plummeted from 19-18 to around 13. I know... this sounds crazy. Some people are saying that this shouldn't happen at all. The fuel gauge and the miles remaining meter are also completely out of sync. It is usually out of sync slightly, but it's getting way out of hand. The screen indicated that I had 70 miles left while in actuality, my tank had less than 30. Does anyone here have an answer and a solution to this? Is this happening to anybody else with this same mod? I really don't want to remove the exhaust (because it sounds amazing) but I might have to if this issue isn't resolved.

PS. Please be kind and helpful.
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post #2 of 5 Old 04-04-2016
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I had the ISR Race on my 3.8 and did not have this issue. They sound unrelated. Try resetting your ECU. But might be a fuel tank issue.

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post #3 of 5 Old 04-04-2016
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It may have a direct relation of wanting to hear sound and accelerating fast to your MPG.

An exhaust wont affect your MPG like this. Its most likely driving habits have changed a little
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post #4 of 5 Old 04-04-2016
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I get a measured 22 - 24 all day long and I'm pretty damn hard on my car, you must have something else going on. Try different gas, I've had bad gas wreck my mileage before.

'15 3.8 Coupe R spec MT ESG - Ark Grip - R2C Short Ram
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post #5 of 5 Old 04-05-2016
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You've had it for 5 days. Just drive and don't worry. If it's thesame way in a month, then start getting concerned.
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3.8 , exhaust help , genesis coupe , mpg

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