STI Exhaust Part Number
 

It appears that there are two different part numbers for the STI Performance Exhaust:

ST44300AS020
ST44300AS010

Is anyone familiar with the differences? I'm guessing it's related to the model changes from 2016 to 2017.

ST44300AS020 was created to fit facelifted 2017+ models. The only difference should be midpipe to axleback connection angle and lenght.

So I would need the ST44300AS010 for my 2016?

Looks like it..

https://www.nengun.com/sti/performance-muffler and https://www.sti.jp/en/parts/subarubr.../ST44300AS010/

Yes. Good choice by the way. I have the same and I am more than satisfied.

Am on the lookout and hope to find it maybe second hand. Really like the look and the sound.

Going to be a long journey. Good luck finding one. :thumbup:

Yes I agree. These ones have a dual structure with a tubular pre-silencer and main silencer arranged in parallel front to back. It is a quite unique design and build quality is similar to jewelry. I would say that they will come a classic and hard to find part. We won't see such a design again. New STI exhaust for the '22 cars will be just a plain silencer.

Keep an eye out on eBay. I got mine from a Subaru dealership advertising clearance stock. Once I saw the seller was in my local area I phoned them direct and he knocked $250 off. Advertised at AU $1300, got it for $1050 and the dealer fitted it for $100, so $1150 overall. Very happy with it, sounds and looks great IMO and not too OTT sound wise.

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STI exhaust

Well done. Looks clean, I always wondered how my car would look debadged. :thumbsup:

I’ve always assumed this part is pretty much cosmetic. It does state on the STI website:

“This high-performance muffler boasts low back pressure and an approximately 13% lower airflow resistance compared to the standard models.”

Does anyone know if there is an actual performance gain, if any? Just more out of curiosity. I have had the part for nearly 3 years now and haven’t noticed any performance improvements.

Most probably as with other catbacks, small if any, mostly done for sound. I see no reasons for miracle to happen and STI's being any different.