Quietest aftermarket exhaust for FiST?

[Ghostwhite]

Thanks, which DP did you use? Some have a disclaimer that they will cause CEL. I prefer to avoid that if possible.

I bought a CPe down pipe, it came with the O2 defouler to counter a cel on a stock tune or stage 1 with Catless downpipe

 

[TurboRon]

Thank you kind Sir, That is a beautiful piece, and music to my ears that it works!

 

[BlueBomber]

To skirt the catless dp cel, get a o2 spacer from 2jr, which should correct the issue or just have a tune that expects a sportcat or catless

 

[Ghostwhite]

Thank you kind Sir, That is a beautiful piece, and music to my ears that it works!

Here's a crappy video of what it would sound like. http://youtu.be/t33ld0sODb0

 

[TurboRon]

Wow, that was louder than I expected! sounds as loud as a full exhaust. could it be the enclosed garage made it louder than on the street?! ... might be difficult for me to live with daily.

 

[Sekred]

That's quite compared to a full exhaust, heres mine. 3" CP-e catted down pipe, 3" cat back with large resonator and muffler.

[video=youtube_share;XCVQcDr2h7g]http://youtu.be/XCVQcDr2h7g[/video]

 

[MKVIIST]

That's quite compared to a full exhaust, heres mine. 3" CP-e catted down pipe, 3" cat back with large resonator and muffler.

[video=youtube_share;XCVQcDr2h7g]http://youtu.be/XCVQcDr2h7g[/video]

Is it the entire CPE exhaust or just their downpipe?

 

[Sekred]

Just the downpipe, rest is custom made-locale exhaust shop.

 

[Ghostwhite]

Wow, that was louder than I expected! sounds as loud as a full exhaust. could it be the enclosed garage made it louder than on the street?! ... might be difficult for me to live with daily.

The garage does make it a little louder on video. It's louder than stock but not by much

 

[MKVIIST]

Just the downpipe, rest is custom made-locale exhaust shop.

I like it, perfect loudness for me.

 

[meFiSTo]

It is so hard to know what something is going to sound like from the clips and what people say. I swapped in a 3-inch SS CBE that was purported to be quiet, but was hella loud and that droned at 3500 rpm. I replaced that with the Borla 2.25-inch diameter CBE and it is comparatively silent (but with a nice tone on WOT and really from 3000 rpm and up).

I'm keeping the stock cat and adding only relatively minor adjustments on the intake end (finally getting installed Monday finally). I don't really get the "3-inch diameter exhausts are quieter" argument. My anecdotal experience was not like that. I suppose it all comes down to the design, materials, and manufacturing (plus any other stuff going on in the intake-combustion-exhaust stream in front of the CBE). It all happens together.

In any event, I would (with 20/20 hindsight) do all the stuff in front of the CBE first and see how that sounds. That is not what I did. But I would now. If that is close to what you like, I would look to the smaller diameter exhausts (2.25 to 2.5). You probably can't go wrong with Cobb or mountune, but I'd bet both are going to be louder than the Borla/FRPP setup. I suspect the Borla/FRPP team developed their product(s) with overall sound containment in mind. My Borla has a nice sound. It burbles slightly on idle, is very stock under 2800 rpm, provides nice feedback on strong acceleration at 3000+ rpm, AND (here's the kicker for me) has NO DRONE at the dreaded 3500 rpm range. That's a win to me, but I'm only going MP215, mountune FMIC, and mountune induction hose. That's it on the intake side.

wwuchris: I see you are local to the Seattle area. Perhaps we can get some Fiesta ST folks together for a burger G2G sometime in the spring. Or a track day! I have some Focus buddies that I could collar as well. Take care and have fun.

 

[TurboRon]

The garage does make it a little louder on video. It's louder than stock but not by much

I hope so. I think a catless DP will make a nice upgrade, (I am guessing that it is the most restricted part of the stock exhaust) I just don't want to get much louder than stock. I wonder if wrapping it will help ?!

...and MeFiSTo - thanks for the 2 cents on exhaust sounds. I totally agree. I'm thinking to go catless DP with stock exhaust.

 

[Kip2MyLou]

I'm going to catted, because I have to because I live in MD, with the stock exhaust. It's the cheaper route and it will give me a good idea of the sound. If I think it's too quiet then I'll just save up for the full Cobb exhaust. I think that's the better route then doing the exhaust first then DP. Just my 2 cents.

And you will see more on the performance side with the DP than the exhaust, especially if you get a pro tune incorporating the DP change.

 

[TurboRon]

Sounds good. Q: what does the bracket on some DPs attach to? anyone?

 

[Sekred]

It bolts to the transmission.

 

[meFiSTo]

I hope so. I think a catless DP will make a nice upgrade, (I am guessing that it is the most restricted part of the stock exhaust) I just don't want to get much louder than stock. I wonder if wrapping it will help ?!

...and MeFiSTo - thanks for the 2 cents on exhaust sounds. I totally agree. I'm thinking to go catless DP with stock exhaust.

Way back when I had an SVT Focus, one of the first things I did was swap the cat out and insert a catless DP. That was with the stock CBE. OMG. That buzzed like CRAZY (not sure I'd call it a drone, but similarly annoying). Then I put in a Borla exhaust and voila: Livable (although clearly louder than stock)...I used catless DPs and catted aftermarket "high flow" DPs with that exhaust and all the setups were livable (stock engine, then Powerworks SC'd engine). So CBE size clearly was not the sole determining factor. I'm happy now and will live with this Borla CBE/stock cat -- tied to some mild intake side changes. ModBargains just posted about a wild little custom circuit that looks promising. Kinda black magic. I'm going to keep an eye on that!

 

[razorlab]

Yea NA motors can "buzz" a bit when going catless. Turbo cars not so much because the turbine acts as a bit of a muffler.

If you put a wastegate dump to air system on the turbo cars the rasp is there. Look up some videos of Evos with wastegate dumps, they sound terrible. I've tuned a bunch of them and always hated tuning them because they are so annoyingly loud on the dyno.

Here is an example:

[video=youtube;mCguvy4vC_E]http://www.youtube.com/watch?v=mCguvy4vC_E[/video]

 

[Kip2MyLou]

All the turbo cars I've heard with just a cat or catless DP without an exhaust system sound fine. I think razor o's right about it only being on NA cars. That makes sense.

 

[meFiSTo]

All the turbo cars I've heard with just a cat or catless DP without an exhaust system sound fine. I think razor o's right about it only being on NA cars. That makes sense.

I really wouldn't know whether that's the deal, but I have VERY limited experience. Basically, just my NA SVT Focus, then the same car with the Powerworks charger, and now this car. And that's probably pretty much going to be it. I did experience intense drone with a 3-inch SS CBE connected to the stock cat with this Fiesta. Not a rasp or buzz, but an intense resonance at 3500 rpm. It was the devil. Now? With 2.25-inch Borla the thing purrs with about the right growl on WOT. I have no idea what was going on with the 3-incher (material, design, construction? who knows). But since I'm not going with a big turbo etc., I'm set. And (big plus) my wife is much happier -- although she now complains about the Recaro passenger seat. Sigh. Thankfully she will not be in the car on track days.

 

[rweidman]

Anyone have a Scorpian system. On sound clips it has a nice zing to the exhaust.