1995 V6 Mustang is this exhaust setup right for back pressure? - Ford Mustang Forum
 
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post #1 of 11 (permalink) Old 01-22-2011 Thread Starter
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1995 V6 Mustang is this exhaust setup right for back pressure?

Hi there,
I had my exhaust rebuilt last week because 1) the cats are removed and 2) the dual setup it had felt terrible on bottom end power.

Opted for a single 2.25 y-pipe with high flow muffler, it now sounds great again...

Headers are still stock.

I have been reading a stack of posts on exhausts and back pressure and different setups, and opinions on removing of cats and how it affects power, frankly i'm a bit confused?

Does the new setup above give the proper back pressure and power? Will appreciate any comments! Thank you


1995 3.8 - K&N, Cowley high flow 2.25" catless y-pipe
Shift kit
******************** Retired

1995 GT vert
Auto
K&N, Powerflow 2.25" offroad x-pipe
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post #2 of 11 (permalink) Old 01-22-2011
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The stock exhaust will give you more torque. Once you allow the exhaust flow easier, torque will drop some. Its natural, but you will gain hp at the higher end. There are ways to compensate for the loss of torque with other options such as gears, tune, etc..


Thrush welded mufflers, Flow Master H-pipe. CAI. Shorty headers. Waiting to get 3.73 gears, body kit.....And wheels....
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post #3 of 11 (permalink) Old 01-22-2011 Thread Starter
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I also read some posts that going with a single setup, 2.5" piping is the minimum to be used for proper flow. Now i assume that would be for a catted exhaust... so i made sure to stick to 2.25" as mine has no cat converter although i do still have all 4 oxygen sensors.

I want to keep as much bottom end power as possible while possibly freeing up a few horses up top end? So in other words as close to stock without too much restriction... Hope i made the right choice :?:

There was a post i read once on exhaust pipe sizes from single all the way through to duals, explaining how much flow volume and flow velocity each allows... it was a great writeup...can't seem to find it anymore!

1995 3.8 - K&N, Cowley high flow 2.25" catless y-pipe
Shift kit
******************** Retired

1995 GT vert
Auto
K&N, Powerflow 2.25" offroad x-pipe
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post #4 of 11 (permalink) Old 02-01-2011
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If you want bottom end, you should've kept your cats...

That being said, your 2.25" tubing size is a good choice. Our 94-98s are only 145-150hp, so according to Magnaflows chart (maybe what you were looking for?), you should use 2.25-2.5" tubing for a single exhaust.
MagnaFlow Performance Exhaust - FAQ, Frequently Asked Questions

FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver
POWER: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage)
STYLE: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs
RIMS: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear
TIRES: BFG KDW/2 245/40R18 front, 275/35R18 rear
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post #5 of 11 (permalink) Old 02-02-2011
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I got 2.5" from the headers and back, can't say I've felt a drop. Then again, I have swapped out the gears

-1995 Conv V6 H/C/I and all bolt ons
-1994 Coupe V6 built by GSS Motorsports, painted by Allen Skaggs (Flawless Customs)
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post #6 of 11 (permalink) Old 02-02-2011
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Ye old backpressure myth!

- 2002 V6 Mustang Daily
- 86 Buick "Nope its a monte calro"
FS: 94-04 heads, cams, ported intakes.
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post #7 of 11 (permalink) Old 02-03-2011
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Quote:
Originally Posted by ESG-642T View Post
Ye old backpressure myth!
OK please explain. I'm one for learning (as long as you can teach it).

FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver
POWER: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage)
STYLE: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs
RIMS: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear
TIRES: BFG KDW/2 245/40R18 front, 275/35R18 rear
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post #8 of 11 (permalink) Old 02-04-2011 Thread Starter
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Quote:
Originally Posted by Silver J View Post
OK please explain. I'm one for learning (as long as you can teach it).
:hihi: LOL


Thanks for the chart, Silver J... Easy how one can start to doubt when you read all this stuff on exhausts and the right sizes... pretty much why i went for single setup - don't have no cats :smoke:

i must say it made my car rev easier without having to step down on it so much. on highway speeds i hardly have to touch the throttle. and when i do its quicker to respond and shift.

I never plan making it into a racecar, would rather just have it driving the best it can, low and high speeds...

I know the "v6 sound" gets stamped on quickly, with the focus being on making it sound as much like a v8 as possible, but i must admit i am enjoying the exhaust note from the single...clean and like a big motor compared to most other v6's i have heard... a lot different from the h pipe but it has a distinct v6 rumble...

1995 3.8 - K&N, Cowley high flow 2.25" catless y-pipe
Shift kit
******************** Retired

1995 GT vert
Auto
K&N, Powerflow 2.25" offroad x-pipe
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post #9 of 11 (permalink) Old 02-04-2011 Thread Starter
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Does anyone know anything about modular engines, what to look out for before buying, weaknesses in the build, etc?

My dad and i are looking at the car i described in the thread below... don't want to hijack the thread but opening another thread is unneccesary

https://www.allfordmustangs.com/forum...uying-1-a.html

1995 3.8 - K&N, Cowley high flow 2.25" catless y-pipe
Shift kit
******************** Retired

1995 GT vert
Auto
K&N, Powerflow 2.25" offroad x-pipe
Marc is offline  
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Quote:
Originally Posted by Marc View Post
Does anyone know anything about modular engines, what to look out for before buying, weaknesses in the build, etc?

My dad and i are looking at the car i described in the thread below... don't want to hijack the thread but opening another thread is unneccesary

https://www.allfordmustangs.com/forum...uying-1-a.html
no

this is unrelated to this thread.. wait for them to answer in your other thread

2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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post #11 of 11 (permalink) Old 02-05-2011 Thread Starter
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Quote:
Originally Posted by Markstang690 View Post
no

this is unrelated to this thread.. wait for them to answer in your other thread
:smoke: will do that...

1995 3.8 - K&N, Cowley high flow 2.25" catless y-pipe
Shift kit
******************** Retired

1995 GT vert
Auto
K&N, Powerflow 2.25" offroad x-pipe
Marc is offline  
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