bye bye stock exhaust

GhettoPop · 07-09-2003, 03:34 PM

My stock stang has 115k miles and is a manual tranny GT. Even the exhaust is stock! In short, I'm replacing stock pipes with a Magnaflow 2.5" cat back and an O/R h-pipe on the stock headers. I'm interested in:

Horsepower gain? will I loose low end torque? i doubt I will actually "feel" a difference?

Sound?

ChunkFunky · 07-10-2003, 07:38 AM

the sound will be your biggest gain, or at least the most noticable... It's one of those "ever bit counts"... you might gain 5 HP but you wont feel it... or atleast, I didnt... but who knows... without cats it'll sound so much nastier... (in a good way) and non STOCK mufflers will certainly change your sound too... carefull of those studs on the stock headers.. they've been rusting away for 115k.. they could snap.. and then you'll have to blow them out and put in new ones... might be a good idea to do that anyway... but just letting you know
-as

GhettoPop · 07-10-2003, 10:10 AM

will the check engine light come on w/o cats?

Dark_5.0 · 07-10-2003, 10:35 AM

My 88GT convertible. went from a 15.35 @88mph to a 14.79 @93.3mph when I changed the exhaust. It had a bone stock engine.

You check engine light wont come on a s long as you run the o2 sensors.

Exhaust halped my car ALOT!!

ChunkFunky · 07-10-2003, 01:04 PM

the numbers dont lie.... I havent run my car at the track with or without cats.. so I dont know any numbers.. I hope they are as drastic as those.... the O2s should thread into your Off Road H pipe and shouldnt cause any codes.. newer cars will have 02s after the cats as a check... and most people will get 02 fakers that tell the computer that it's all cool.. even though they ditched the cats... sneaky eh?
-as

USMC302 · 07-11-2003, 02:18 PM

Call me crazy, but on one of my stock 88GT's, I threw on a off road h-pipe for the first mod and felt the difference immediately.

briand · 07-11-2003, 02:49 PM

the off road pipe mod was my first mod, my car went from a 15.66 to a 15.30 with one installed. if nothing else, a good exhaust system is a great foundation for future modifications

07-09-2003, 03:34 PM	#1
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	bye bye stock exhaust My stock stang has 115k miles and is a manual tranny GT. Even the exhaust is stock! In short, I'm replacing stock pipes with a Magnaflow 2.5" cat back and an O/R h-pipe on the stock headers. I'm interested in: Horsepower gain? will I loose low end torque? i doubt I will actually "feel" a difference? Sound?

07-10-2003, 07:38 AM	#2
ChunkFunky Registered Member Join Date: Apr 2002 Location: Tustin, CA Posts: 465	the sound will be your biggest gain, or at least the most noticable... It's one of those "ever bit counts"... you might gain 5 HP but you wont feel it... or atleast, I didnt... but who knows... without cats it'll sound so much nastier... (in a good way) and non STOCK mufflers will certainly change your sound too... carefull of those studs on the stock headers.. they've been rusting away for 115k.. they could snap.. and then you'll have to blow them out and put in new ones... might be a good idea to do that anyway... but just letting you know -as __________________ '89 GT Convertible: TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit

07-10-2003, 10:35 AM	#4
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	My 88GT convertible. went from a 15.35 @88mph to a 14.79 @93.3mph when I changed the exhaust. It had a bone stock engine. You check engine light wont come on a s long as you run the o2 sensors. Exhaust halped my car ALOT!! __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

07-10-2003, 01:04 PM	#5
ChunkFunky Registered Member Join Date: Apr 2002 Location: Tustin, CA Posts: 465	the numbers dont lie.... I havent run my car at the track with or without cats.. so I dont know any numbers.. I hope they are as drastic as those.... the O2s should thread into your Off Road H pipe and shouldnt cause any codes.. newer cars will have 02s after the cats as a check... and most people will get 02 fakers that tell the computer that it's all cool.. even though they ditched the cats... sneaky eh? -as __________________ '89 GT Convertible: TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit

07-11-2003, 02:18 PM	#6
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Call me crazy, but on one of my stock 88GT's, I threw on a off road h-pipe for the first mod and felt the difference immediately. __________________

07-10-2003, 10:10 AM	#3
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	will the check engine light come on w/o cats?

07-11-2003, 02:49 PM	#7
briand Registered Member Join Date: Mar 1999 Location: Jackson, LA Posts: 264	the off road pipe mod was my first mod, my car went from a 15.66 to a 15.30 with one installed. if nothing else, a good exhaust system is a great foundation for future modifications __________________ GT-40X heads(58cc), Cobra upper and lower, 75 mm Bullet, Moroso fenderwell induction, FRPP 65mm TB, 24# injectors, black magic electric fan, phenolic spacer, 1.7 crane cobra roller rockers, crane 2031, BBK 1 5/8 equal length hearders, 2.5 inch off road pipe, 2.5 flowmaster catback, FMS 3.55 gears, T5-Z transmission, FRPP aluminum driveshaft, svo heavy duty clutch, mcleod bullet proff bellhousing, BBK adjustable cluth quadrant, hurst billet shifter, lakewood subframes, BBK strut tower brace, BBK 2pt lower cross bar, FMS 190 lph fuel pump, crane ps91 coil, FMS street pulleys, and 300+ race wires. All thanks goes to my wife sheri, jason, jeff, robby, my dad and all others you helped contribute. most importantly GOD!!!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Exhaust just fell off....	Rosco	Windsor Power	3	05-19-2003 12:29 PM
do-it-yourself exhaust system	nielsmobers	Classic Mustangs	3	05-13-2003 09:45 PM
stock stainless steel exhaust?	GhettoPop	Windsor Power	3	04-23-2003 12:57 PM
Cobra-R Side Exhaust -- SWEEET!	SkammyManX	Modular Madness	3	04-05-2003 11:58 AM
Stock Cobra exhaust worth anything??	Dark_5.0	Modular Madness	3	01-02-2003 05:26 PM