Full exhuast exchange

I hate Rice · 09-11-2001, 03:44 PM

How many hps would be resonable to expect from a complete exhuast exhchange? Equal length short tube headers, off-road x and a set of macs or flows? What should I expect from an change like that on a 97 gt. thanks.

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97 Mustang GT Convertible
http://www.mustangworks.com/cgi-bin/...splay.cgi?1858
K&N filter
No silencer
Sidewinder 5000 Alarm

Gotta love Rice cuase they always travel in groups so you can embaress them in front of their buds.

blue00gt · 09-12-2001, 06:11 PM

I would guess about a 15hp gain on a stock car.

96GTfanatic · 09-12-2001, 09:30 PM

i would have to say around 20-25 rwhp. i got offroad h-pipe & 2 chamber flowmasters and made my car noticably faster. Headers which i dont have also make a big difference

91LX2Bfast · 09-14-2001, 05:08 PM

Don't waste the $ on the headers. It takes too much time and work and/or costs too much in labor to justify spending the $ for the small gains. The stock heads don't flow well enough to utilize the headers.
A high Flow H-pipe will be the best bang for buck. That should add anywhere from 8-14hp. A good set of mufflers, or a full cat-back may help to free up another 2-4hp.

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1997 Thunderbird 4.6L: Dynomax cat-back, MN-12 perf. offroad downtubes and Y-pipe w/ Magnaflow resonator, 80mm MAF with cone filter, B&M trans cooler, Inject-Tech chip, KVR front brake upgrade. 15.2 @ 91 before exhaust. Not bad for a 3800lb auto 4.6L

No Longer own: 91 LX 5.0L 5 spd

blue00gt · 09-17-2001, 07:07 PM

Long tube headers are supposed to work a lot better on mod motors. Shorties supposedly only give 2-4hp.

91LX2Bfast · 09-19-2001, 07:11 PM

Longtubes will cost $1000+ to buy and have installed. And the "decent gains" are on PI headed mustangs. For N/A 2V's, that $ can be better spent somewhere else.
The 96-98 heads in don't flow well enough to need headers in N/A situations. The $ to HP ratio would be foolish.

SMOKE · 09-20-2001, 12:07 PM

91LX2Bfast
Agreed but if there's forced induction in the future LTs have shown the best results.

Build for the future.

09-11-2001, 03:44 PM	#1
I hate Rice Registered Member Join Date: Aug 2001 Posts: 81	Full exhuast exchange How many hps would be resonable to expect from a complete exhuast exhchange? Equal length short tube headers, off-road x and a set of macs or flows? What should I expect from an change like that on a 97 gt. thanks. ------------------ 97 Mustang GT Convertible http://www.mustangworks.com/cgi-bin/...splay.cgi?1858 K&N filter No silencer Sidewinder 5000 Alarm Gotta love Rice cuase they always travel in groups so you can embaress them in front of their buds.

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09-12-2001, 06:11 PM	#2
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	I would guess about a 15hp gain on a stock car.

09-12-2001, 09:30 PM	#3
96GTfanatic Registered Member Join Date: Jul 2001 Location: Philadelphia Posts: 93	i would have to say around 20-25 rwhp. i got offroad h-pipe & 2 chamber flowmasters and made my car noticably faster. Headers which i dont have also make a big difference

09-14-2001, 05:08 PM	#4
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	Don't waste the $ on the headers. It takes too much time and work and/or costs too much in labor to justify spending the $ for the small gains. The stock heads don't flow well enough to utilize the headers. A high Flow H-pipe will be the best bang for buck. That should add anywhere from 8-14hp. A good set of mufflers, or a full cat-back may help to free up another 2-4hp. ------------------ 1997 Thunderbird 4.6L: Dynomax cat-back, MN-12 perf. offroad downtubes and Y-pipe w/ Magnaflow resonator, 80mm MAF with cone filter, B&M trans cooler, Inject-Tech chip, KVR front brake upgrade. 15.2 @ 91 before exhaust. Not bad for a 3800lb auto 4.6L No Longer own: 91 LX 5.0L 5 spd

09-17-2001, 07:07 PM	#5
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	Long tube headers are supposed to work a lot better on mod motors. Shorties supposedly only give 2-4hp.

09-19-2001, 07:11 PM	#6
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	Longtubes will cost $1000+ to buy and have installed. And the "decent gains" are on PI headed mustangs. For N/A 2V's, that $ can be better spent somewhere else. The 96-98 heads in don't flow well enough to need headers in N/A situations. The $ to HP ratio would be foolish.

09-20-2001, 12:07 PM	#7
SMOKE Old School ROUSH Join Date: Nov 1999 Location: Stockbridge, GA Posts: 531	91LX2Bfast Agreed but if there's forced induction in the future LTs have shown the best results. Build for the future.