Does anyone know how to put 3" exhaust on a 1999-2004 Mustang GT? - Ford Mustang Forum
 
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post #1 of 13 (permalink) Old 06-08-2010 Thread Starter
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Does anyone know how to put 3" exhaust on a 1999-2004 Mustang GT?

I love how loud transams with 3" exhasut are! I know stangs are 2.5" can I make a 3" exhaust for it and run it to my MAC longtubes? Is this hard? expensive? even possible? thanks


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post #2 of 13 (permalink) Old 06-08-2010
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Quote:
Originally Posted by ITALIANMUSTANG View Post
I love how loud transams with 3" exhasut are! I know stangs are 2.5" can I make a 3" exhaust for it and run it to my MAC longtubes? Is this hard? expensive? even possible? thanks


you shouldnt run 3inch exhaust unless you have enough horse power to reap the benefits of it or it will be too much


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post #3 of 13 (permalink) Old 06-08-2010
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Quote:
Originally Posted by ITALIANMUSTANG View Post
I love how loud transams with 3" exhasut are! I know stangs are 2.5" can I make a 3" exhaust for it and run it to my MAC longtubes? Is this hard? expensive? even possible? thanks
sure, you can put 3" dual exhaust on your stang...practical, no. The reason why Transam have 3" exhaust is because it is not true dual. I know this because i use to have a TA. I actually believe you'll lose HP with 3" dual exhaust unless you're running HP numbers.

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post #4 of 13 (permalink) Old 06-08-2010
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to put it into perspective the motor that is being built this summer for my gt with be a 5 litre stroker with lots of head work and comp stage 2s and it will make 280-310 horsepower (auto numbers) and 330-350 ftlbs and 2.5 inch exhaust is fine for me

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post #5 of 13 (permalink) Old 06-08-2010
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judging by your sig you dont make enough hp to warrant 3inch exhaust

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post #6 of 13 (permalink) Old 06-08-2010
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MAC makes a bolt on 3" exhaust, but it's not needed. As stated before, the Trans Am has 3" because it necks down to a single pipe. You have 2, so 2.5" is more than enough to make as much HP as you want.

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post #7 of 13 (permalink) Old 06-08-2010
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what are ur futer plans for the car? if you are going to be a high horse power car maybe get some 3" so you dont have to spend money twice. and shorttie i bet you will see more than 310 if you do heads and get a 5.0 stroker kit

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post #8 of 13 (permalink) Old 06-09-2010
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your mods do not warrent the need for a 3' exhaust. it will actually cause you to loose hp rather than gain it.

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post #9 of 13 (permalink) Old 06-09-2010
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A pipe will flow 115cfm per square inch of cross-sectional area. You need approximately 2.2cfm of flow capacity per horsepower.

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if you put true duel 3 inch exhaust on your car you can pretty much forget all about low end torque, your engine NEEDS back pressure unless you are building a 1200 Hp racing engine, you have no need for 3 inch exhaust and you will have a HUGE noticable loss in low end power


to put Bullitts statement into perspective, a 300 horsepower engine would need 660 CFM of exhaust flow, which would require around 5 square inches of cross sectional area, a 3 inch pipe has 7 square inches of cross sectional area
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Quote:
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if you put true duel 3 inch exhaust on your car you can pretty much forget all about low end torque, your engine NEEDS back pressure unless you are building a 1200 Hp racing engine, you have no need for 3 inch exhaust and you will have a HUGE noticable loss in low end power


to put Bullitts statement into perspective, a 300 horsepower engine would need 660 CFM of exhaust flow, which would require around 5 square inches of cross sectional area, a 3 inch pipe has 7 square inches of cross sectional area
And that's a single 3" pipe, not duals.

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Quote:
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And that's a single 3" pipe, not duals.
exactly hahaha

duel 3 inch pipes will be maxed out by an engine putting out around 750 horsepower
anything less than that and you won't be gaining anything by putting huge pipes on
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post #13 of 13 (permalink) Old 06-15-2010 Thread Starter
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Thanks thats good to know. Appreciate it.

2003 Torch Red Mustang GT Conv 4.6L V8 (Black Top/Stripes) w/93k mi
Performance:Auto to Manual at 92k mi, TKO500 5Spd Race Trans, 4.10 Gears, Stage 2 DF Centerforce, AEM CAI, Accufab Polished 75mm TB/Plenum, Slotted Rotors, Cer Pads, Eibach ProKit, MAC O/R H-Pipe, Borla Stinger Catback, Diablo Sport (JPC)
Some of Asthetics: Black Chrome MetalFx 18x9 Rims, Nito 555 245/40/18s, Tint, Stylin Bar, Black Heads/Tails/3rd, Red Cal, Leather BOMZ Race Seats w/4pt, 8k HIDs
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