Well, I dropped the car off tonight and am finally having my Stainless Works exhaust system installed tomorrow.

1-5/8 Long tube headers
High flow CATs
X-pipe
Performance Mufflers
3" piping
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Ordered in March, shipped May 18, cleared customs May 25. Then dropped headers off at Koot Coat May 26 and added the other exhaust parts May 31.
Then they ran out of black ceramic!! Finally picked up last Wednesday.

Before pics:
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Bob didn't waste any time getting started...most of the old parts came off while I watched and are home here already:
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I can't wait to hear it tomorrow night. Will post more pics and sound clip when I can...

 

Nice exhaust now what stroker kit and supercharger are you going to add to support that nice exhaust system? because 3" is WAY WAY too big without a stroked/ supercharged motor to back it up

 

dont forget turbo. ive heard that exhaust...very loud haha

 

Why do you think 3" is way too big?

 

because the 2.5 flows fine. A 3" exhaust is typically used for boost applications, not N.A. I personally feel the same way, 3 inch is way too large for a stock 3v motor....everything with a car should be in proportion....i learned this the hard way by putting dumps on a v6 mustang....had absolutely no power down low but when i hit 5 grand it pulled as hard as a v6 can. With 3" your just shifting the power band....

 

I make plenty of power with my 3" stainless works exhaust. These Mustangs are not like anything from the past. A mechanic/racer buddy of mine is in a whole new learning curve with this car. My tuner thought I was going to loose back pressure with the 3". He was very surprised to see the gains. 3" is NOT too big for this car N/A or blown!

 

I agree with David I think the VCT on the engines dictate the torque and horsepower difference between top and bottom end more than any other changes to previous years.

It will be interesting to see if new cam grinds can be made that still take advantage of the VCT. When this happens I think you will start seeing large power increases on both low end and top end power.

 

Ok, Tom, Joe...what's the bottom line here? If David has seen nice gains with his 3", are you suggesting that he'd have seen more with 2-1/2"??

 

i wanna see his dyno with just the stainless works 3"...i just think it shifted the power band.... he might have had nice gains in say the > 4500 rpm range but may have dropped off in other areas...i personally still feel that 3" is too large...you need some backpressure on n.a. its just the bottom line

 

Here is Davids dynos

Stainless 3" Exhaust Dynos

Looks like there are no powerband shifts and he is using 3/4" long tubes

 

compare that to a full 2.5 system... it appears that he gained top end but not a lot of bottom.....the only other mod was just with IMRC's am i correct?

 

It didn't gain a lot on the bottom end. Does this mean that backpressure loss hurt the performance? The top pull is just with IRMC's.

 

i personally dont think it hurt the performance...it just shifted the powerband... the engine is just freaking out because exhaust just flows out so easily. Kinda like pulleys...you dont really get any hp off of pulleys...you just free up hp....exhaust doesnt really gain hp...it just moves the powerband and frees it up

 

Just got a call from Bob...he's got everything on except the mufflers, which he's having trouble lining up. Hangers appear to be in the wrong place? Going to go investigate at lunch time...

 

humm thats no good...the stainless works that i saw looked nice

 

I'm not jumping to any conclusions yet...Bob did say he stayed late last night to work on it. I know how lack of sleep can fog the brain!

 

Hey guys-

3" is WAY too big for a N/A bolt on 05 Mustang GT-

We have the capability to make up to a 6" exhaust if we wanted to for this car- but we don't and for a good reason-

We dyno tested several 2.5" and 3" systems on various stock and bolt on cars, and the 2.5" provided more power under the curve EVERY time-
Tuning has nothing to do with physics- bottom line

The key to a well functioning exhaust system is maintaining the highest exhaust velocity possible while the least amount of back pressure possible-

The problem with the 3" is while it provides little to know back pressure, your velocity is going to be slow due to the fact that the 3v is just not making the power to push the exhaust through-

which is why the 3" systems are so loud, the sound waves are bouncing through the system very slowly which increases the over all noise of the exhaust system-


Basically, a bolt on 03/04 Cobra does not even need a 3" system- why would an 05 GT?

There is a reason why Bassani, Borla, Magnaflow, Flowmaster dont make 3" exhaust systems for the 05- its not because we can't its becuase you dont need that size exhaust until you are making 650hp-


considering the small number of cars making that kind of power, it is not profitable for any of us to making something like that at this time-

If there were gains in a 3" system, Steeda, Saleen, and Roush would be all over it- yet even on their supercharged cars- they still use 2.5"

This reminds me of all of the guys building these 6" diesel exhausts for Power Strokes- all they say is bigger is better- yet when you talk to Banks- they all laugh at the idea of 6" exhaust and question even a 5" exhaust-


a 3" exhaust will not just move the power band, it will make for a more peaky power band based on our research- 2.5" provides much flatter power curves- which is what you want on a street/track duty car-

This is our theory on the 2.5" vs 3" systems-

 

BTW- I am not questioning the quality of the Stainless Works Sytem- They do look very nice-

I am just giving our own theory on the matter-

 

i definately agree... stainless works make a grade A exhuast...in terms of looks and sound...but its not totally performance driven. The stock exhuast flows very well imo

 

The stock exhaust is actually very good on this car- I would agree-

The reason is the 3V motors are much quieter then the 2V motors-

In fact a 2v with Magnapacks is louder then a 3v with straight pipes based on our research-

For this reason, Ford was really able to open up the facotry exhaust and still have it come under Federal compliance-

Of course there is still some power left with a nice aftermarket system- but gone are the days of seeing 15rwhp with a catback like you did on the 2v cars-

Just a little insight from what we have found based on our time with these cars-