I have normally gone and done custom exhausts on my previous cars, but this time I was looking into having a bolt on specifically engineered for the FiST. So I can easily put in on or take it off.
So far I have come across this
Would there be a reason to use 2.25? Or is that just sticking with the stock diameter? A larger pipe would increase flow but do we have to worry about things like back pressure?
I'm sure the baby snail creates plenty of back pressure. I'd save your money for a high flow cat/downpipe and skip the catback till dynos are done. Its a lot of money for some pipe that may not be needed till the stuff up front is cleaned up.
I like the sound of the factory exhaust but it is pretty quiet. Some people are looking for sound.
I personally want performance first but if I don't get good sound I'll be tweaking things (I'll be making a 3" system from mandrel bends if no one CNC bends a nice 3" cat back and I'll be working cat forward too, EFR turbo probably).
from what I have gathered, a properly designed exhaust for the ST will do wonders for the car. The ST exhaust is the same in the US as it is in Europe, where it needs to be quiet and restrictive.
I don't think I like it... Sounds a little "wet" to me. I want a subtle note that isn't too loud but you can still hear it growl. Like the the sound you hear in the cabin from the symposer... but coming out the back.
Would there be a reason to use 2.25? Or is that just sticking with the stock diameter? A larger pipe would increase flow but do we have to worry about things like back pressure?
For turbo cars there is no backpressure tuning. The design goal is to get the heat out and away from the turbo as fast as possible.
2.25 seems tiny to me. I'd be looking for 2.75 minimum for a 1.6L turbo. Larger than 3" probably has diminishing returns due to extra weight, unless you are upgrading to a much larger turbo.
For comparisons sake, when the neon srt4 came out, they had 2.25" exhausts with only a resonator in them (no additional muffler). They dyno'd around 210 wheel hp stock depending on year. The upgraded mopar performance exhaust (built by borla) was 2.5". Both exhausts were mandrel bent. The nsrt4 was a 2.4l engine, with a larger turbo than the ST, at a lower boost level.
In my opinion, I'd think a 2.5" catback would be fine for a ST running a stock turbo. In my understanding of turbo systems, a 3" down pipe would be more beneficial as back pressure farther away from the turbo has less effect on performance.
If the non res Milltek don't drone too bad inside the car while at highway speeds, this is EXACTLY the music I crave to hear! I loved the sound of my R32's VR6 with the resonated Milltek, and trust their ST versions will be just as top notch. Just when it it be available for us here? And how much?
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