Lack of power midrange after exhaust upgrade

Scolagiaco · April 27th, 2008, 04:51 PM

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?

TurboLX · April 28th, 2008, 08:59 AM

Flowmasters reduce power from what i hear

Kobra Killer · April 28th, 2008, 12:12 PM

I would check the O2 sensors. May need a re-tune also 'cause the computer is still programmed for the old exhaust system.

BLACJAC · May 2nd, 2008, 08:24 PM

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

Regency 2007 · May 6th, 2008, 11:34 PM

choke masters is what I like to call them... they do sound good on mustangs though...

April 27th, 2008, 04:51 PM	#1
Scolagiaco Newbie 2007 Mustang GT/CS Join Date: Apr 2008 Location: Kissimmee,FL Posts: 6	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?

April 28th, 2008, 08:59 AM	#2
TurboLX MM Ninjas! 1990 Mustang LX Turbo 8.675 @ 165.91 Join Date: Oct 2006 Location: New York Posts: 7,925	Flowmasters reduce power from what i hear __________________ (Wiring Diagrams For ALL Mustangs And OBDII/Generic DTC Available. PM For Info) FORD 2.3 FORUMS

April 28th, 2008, 12:12 PM	#3
Kobra Killer Regular Join Date: Sep 2006 Location: Arvada, CO Posts: 51	I would check the O2 sensors. May need a re-tune also 'cause the computer is still programmed for the old exhaust system. __________________ Clevelands Rule https://home.comcast.net/~jimmiephil...er_project.htm

May 2nd, 2008, 08:24 PM	#4
BLACJAC Regular 2006 GT 13.69 Join Date: Mar 2007 Location: Milford Ct. Posts: 182	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 __________________ BORLA STINGERS ,AIRAID CAI , 3.73 FORDRACING GEARS AND VAST BILLET INTERIOR AND EXTERIOR JEWLERYBLACJAC's Profile » MyMustangSite.com - ford mustang

May 6th, 2008, 11:34 PM	#5
Regency 2007 Hardcore Enthusiast Join Date: May 2007 Posts: 1,116	choke masters is what I like to call them... they do sound good on mustangs though... __________________ From Spoolin' to Pullin...

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