Lack of power midrange after exhaust upgrade - Forums at Modded Mustangs
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post #1 of 5 Old April 27th, 2008, 05:51 PM Thread Starter
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Lack of power midrange after exhaust upgrade

07 GT,automatic. Just installed the Flowmaster Axle-back kit and it sounds sweet, but 2 days later I began to notice a loss in power, but I'm sure if its related to the exhaust change. Whats happening is while I'm accelerating and I reach 40 mph the transmission shifts and I get a load groan and the RPM goes to about 1700. I continue to press down the throttle and I get almost no response or just a little response. The only way to get out of that is either back off the throttle and re-apply or just slowly bring it to wide open throttle which would force a shift to get back the power band. It always has done this on occasion but now its worse after the exhaust install. 1 other note, I have heard people say that exhaust clamps alone without welding is a bad idea. And that a leak can develop at the slip-fit connections, could that be why for loss of acceleration/power? And can a leak there actually rob power?
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post #2 of 5 Old April 28th, 2008, 09:59 AM
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Flowmasters reduce power from what i hear

1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.
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post #3 of 5 Old April 28th, 2008, 01:12 PM
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I would check the O2 sensors. May need a re-tune also 'cause the computer is still programmed for the old exhaust system.
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post #4 of 5 Old May 2nd, 2008, 09:24 PM
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THE COMPUTER TAKES about 7-10 miles to cycle and grab the power after that there shoudnt be any problems if there is take it back to the dealer
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post #5 of 5 Old May 7th, 2008, 12:34 AM
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choke masters is what I like to call them... they do sound good on mustangs though...
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