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For those thinking about a "performance" exhaust system

Cruising68

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#81
Straight pipe v6 sends bad chills up my spine.

How about nitrous, anybody try a 100 shot?


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BigAnt75

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#82
I thought I'd add another post to this thread. There are many posts like @JeffSpicoli above and between that post and today, I've seen scores of similar posts. There seems to be many people who think the first thing one "MUST" do to achieve performance is to swap the factory exhaust and intake. For the ST, I completely disagree.

But where does this idea come from? Vendors trying to sell exhausts? People just wanting more vroom? Or something else?

Let me put this forward- it's because the ST is not your Dad's (or your's) 20-30 year old turbo vehicle. The conventional wisdom about older vehicles (perpetuated by vendors, and those who bought the products) is that there are huge performance gains with an exhaust and intake.

What you might not realize is the technology was nowhere near where it is today. Any idiot could muck about with an aquarium valve to screw with boost pressure. You could also play games with mechanical adjustment of the wastegates; and buy manual or even electronic wastegate controllers. Which would work...until you lost that rod bearing or piston.

No manufacturer wants pissed off customers, nor do they wish to replace engines under warranty. So, what might be a solution in the days before the sort of technology we now have in a turbo vehicle? Simple, use the intake and exhaust as additional boost control mechanisms. A restrictive exhaust and/or intake provides a little bit of insurance to the engine when someone ignorant plays boost games.

This then led to the idea that you "had" to change the factory intake and exhaust to make gains- and this was correct thinking at the time. Of course that high-flow intake and exhaust led to thousands of destroyed engines since that very restriction was part of the manufacturers' boost control strategy. And once you overrode that capacity, unless you had a good tuner, you were also overriding the injector capacity, the timing correction capacity, the MAF sensors, etc.

The ST is not in that category. The intake and exhaust are NOT a limited factor at 25-35% over the factory HP (mass airflow) rating.

If you go above that 25-35%, you might need to think about playing with the intake or exhaust. But to achieve that, you'd have to replace the stock turbos. Even then, mathematically, the stock exhaust system should easily be good for 650+ HP (that doesn't include the downpipes which I would replace along with the turbos).

Now as posted earlier, if you are only interested in some acoustical gain- buy whatever you want, it's your money. But don't post about butt-dyno HP gains (and God forbid MPG gains) from intakes and exhausts and expect to be taken seriously.
So what would you suggest for an affordable way to be louder? Obviously 3inch compared to a 2.5 isn’t noticeable at all so looking for the best route just to add a little more tone.
 

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TMac

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Thread Starter #83
So what would you suggest for an affordable way to be louder? Obviously 3inch compared to a 2.5 isn’t noticeable at all so looking for the best route just to add a little more tone.
There are a number of exhausts that are "louder" on the market. If you're a DIYer, and want to keep stock exhaust, I'd replace the stock mufflers with something with less volume.
 

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#84
That's probably true. Coming from a performance background, I'm just putting out information for those few people who are looking to optimize the platform while getting the best "bang for the buck". And as I stated in my first point, if your goal is to change the acoustics, buy whatever pleases you! For me, I prefer more of an even bank firing Ferrari sound as opposed to a v8 rumble, which is pretty hard to achieve from the ST v6. But then, some people love the "potato, potato" sound of a harley v twin. To each his own.
I must admit, I have nowhere near your expertise, so I will ask: what performance mod do you recommend for the best bang?
 

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TMac

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Thread Starter #85
I must admit, I have nowhere near your expertise, so I will ask: what performance mod do you recommend for the best bang?
An intercooler and a tune will get you the best bang for the buck.
 

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#86
@TMac, definitely respect the discussions you’ve provided here. I just picked up a new to me ST and initially planned on IC, exhaust and tune, but after reading through this it seems an exhaust might not be the best money spent. That being said, I do want a little more sound so thinking an axel back/some sort of aftermarket muffler. What’s your proposal for the flex pipe issue? Let Ford fix that or go an aftermarket route?
 

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