Free flowing silent exhaust...possible?

[SVXMAN2001]

Subject pretty much says it all, what are my options for creating a more efficient, more free flowing exhaust, that is as quiet as the stock set up if not quieter? Any ideas of what components would achieve this?

[Crazy_pilot]

I've been working toward putting a system together which *should* fit that bill pretty closely. I haven't bought any parts or started making anything yet, but the design is pretty much solidified. It basically mirrors the stock system in terms of layout, but with high flow components.

2" piping off the stock headers to 2 Magnaflow mini-cats (P/N 50004). Then more 2" into a Magnaflow 2-1 cat (P/N 94007). This goes into 2.5" tubing to a Magnaflow resonator, then 2.5" to behind the rear axle. This is where it gets a bit tricky. I want to do a sharp-ish bend after the diff to center the pipe, then fabricate a 1-2 y-pipe, reducing from 2.5" to 2", with 90° curves. This will go into two Borla turbo mufflers, and then out through a good set of tips.

Everything ahead of the rear axle will be similar to the stock SVX setup, the final mufflers will resemble the Flatt Racing exhaust.



I think with the extreme use of things in the system (6 components compared to one cat and one giant tin can muffler on your suped up STi's out there) it should be a very low volume, but should still flow very well.

Also, I priced out the whole system through a local parts guy who offers deals to the local Subie club. I can have all the cats, resonators, and mufflers for about $650.

If you've ever seen the SVX's stock muffler apart, it's a convaluted mess of big pipes. I'd say that's where 80% of our exhaust restrictions are.

[SVXMAN2001]

interesting...let us know how the progress goes.

[TomsSVX]

I just finished up a new exhaust. Has a great tone, ever so slightly louder than stock and flows very well.

Stock head pipes & pre-cats
2-1 Magnaflow highflow cat
stock resonator tubing
Back to a transverse polished Bullet 1-2 muffler
Out through magnaflow tips...

Will post pics in a little while. This exhaust could be made louder with the removal of the pre-cats and possibly the resonator, but I don't think thats what the owner wants. Right now it just sounds like a dream and looks great too!

Tom

[SVXMAN2001]

Tom, anyway you would be able to get a soundclip of it?

[processengr]

Originally Posted by SVXMAN2001

Tom, anyway you would be able to get a soundclip of it?

plus one!