K2e2vin Posted May 8, 2013 Share Posted May 8, 2013 So per everyone's suggestion, I've decided to get a downpipe. The cheapest I could find was a Tomioka catless downpipe(I have a twin-scroll btw) for $450, so I decided to go custom which I was quoted $300 for a catless or $400 for one with a metal-core Magnaflow cat,;both are 3"; I'd just need to supply the flange which is $18 off eBay. Anyways, I still have the stock exhaust on there and honestly, I just like the way it looks. I've thought about the STi mufflers but looks like a tight fit; and of the aftermarket ones I've seen the Q300 looks nice but more than I want to spend. Does anyone know if the stock mufflers are actually restrictive? I'm thinking about having the shop just install 3" piping all the way to the Y-pipe; but if they're restrictive wouldn't it be better to just have the shop leave the CBE piping alone and just later just upgrade? Regarding sound, I love a deep tone but do not want anything loud at all(basically silent at idle or light rumble during cruise would be nice). Link to comment Share on other sites More sharing options...
Brett Posted May 8, 2013 Share Posted May 8, 2013 add a resonator and a quiet set of mufflers. borla makes some quiet mufflers Link to comment Share on other sites More sharing options...
goneskiian Posted May 8, 2013 Share Posted May 8, 2013 Can't beat stock for quiet. Mufflers aren't that restrictive. I know of a local to me running over 400hp on stock mufflers. He likes to be stealthy. Cheers! Link to comment Share on other sites More sharing options...
Brett Posted May 8, 2013 Share Posted May 8, 2013 have you ever seen the inside of our mufflers? it's terrible. i disected one to find out Link to comment Share on other sites More sharing options...
sabotaged Posted May 9, 2013 Share Posted May 9, 2013 I think it's been proven before on here that the stock exhaust post downpipe is not restrictive. If you want quiet I would not toy with a CBE, unless you sit in someone else's car and hear it. Don't even bother listening to youtube clips. If you want mostly quiet but with a little extra rumble I'd look at a muffler replacement. Link to comment Share on other sites More sharing options...
Brett Posted May 9, 2013 Share Posted May 9, 2013 the inside of a muffler is like an "S" shape so it's pretty restrictive. dp will still give you alot more power, but without a 3" cbe you'll be missing at least 15whp Link to comment Share on other sites More sharing options...
robinlsb Posted May 9, 2013 Share Posted May 9, 2013 I have yet to see a stage II CBE provide more than 5WHP. "Belief does not make truth. Evidence makes truth. And belief does not make evidence." Link to comment Share on other sites More sharing options...
Brett Posted May 9, 2013 Share Posted May 9, 2013 that was straight from a tuner. the guy knows what he's talking about Link to comment Share on other sites More sharing options...
.Catalyst. Posted May 9, 2013 Share Posted May 9, 2013 What tuner. There are lots of "tuners" and not all of them are what I'd personally consider knowledgable. I know of several LGTs running 300+ AWHP on stock cans. Leaving a touch of power on the table... perhaps. 15WHP?? Dyno plots or GTFO, or as the almighty TurboDog says, "back it up or retract!" My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
I Donated thefultonhow Posted May 9, 2013 I Donated Share Posted May 9, 2013 What tuner. There are lots of "tuners" and not all of them are what I'd personally consider knowledgable. I know of several LGTs running 300+ AWHP on stock cans. Leaving a touch of power on the table... perhaps. 15WHP?? Dyno plots or GTFO, or as the almighty TurboDog says, "back it up or retract!" Jermaine from TurboXS said I'm probably leaving 20-30whp on the table due to the stock cans. The rest of the TBE has been upgraded (UP, catted DP, Perrin mid/Y). I made 265whp on a 16G at 20psi, and you could see the graph tail off up high (peak hp was below 5000 rpm). He kept on trying to add timing and richen the AFRs, but he said the back pressure was causing knock, so he had to back it back off. I am also running a stock TMIC that has been bulletproofed, so that may be part of the restriction, but the impression I got from Jermaine is that the cans were the majority of it. Link to comment Share on other sites More sharing options...
.Catalyst. Posted May 9, 2013 Share Posted May 9, 2013 While I anticipate there are some ponies left on the table, I still would like to see quantifiable data. I don't doubt Jermaine knows Subarus, and hope he gets your tune dialed if that is in fact what's causing the weird boost behavior. My spec.B [#163] Project Thread with Pictures Get CryoTuned! Link to comment Share on other sites More sharing options...
I Donated thefultonhow Posted May 9, 2013 I Donated Share Posted May 9, 2013 While I anticipate there are some ponies left on the table, I still would like to see quantifiable data. I don't doubt Jermaine knows Subarus, and hope he gets your tune dialed if that is in fact what's causing the weird boost behavior. If I have to go down there again, I will manually open my broken e-cutout and see how much I gain. It was running 20psi on the dyno, though, so the tune was not the issue then as it is now. Link to comment Share on other sites More sharing options...
K2e2vin Posted May 9, 2013 Author Share Posted May 9, 2013 I don't think the S-shape or a chambered design would necessarily make it restrictive; but maybe the piping is too small? I mean, if I replace the muffler wouldn't it be better to go with a chambered muffler anyways if sound is a concern? thefultonhow, could it be possible the backpressure you were experience may have been pre-turbo? Link to comment Share on other sites More sharing options...
Brett Posted May 9, 2013 Share Posted May 9, 2013 this is coming from Dan Hill at Agile. 3" midpipe and 2.5" y is all you need, but it would be pointless to have stock cans unless you're keeping it quiet. i'll find out when i get a tune, then cbe. you'll be the first to know Link to comment Share on other sites More sharing options...
K2e2vin Posted May 9, 2013 Author Share Posted May 9, 2013 I wonder if the STi mufflers would be quiet enough. They look like they use much larger piping: http://legacygt.com/forums/showpost.php?p=2396510&postcount=49 Link to comment Share on other sites More sharing options...
Brett Posted May 9, 2013 Share Posted May 9, 2013 i can remember someone saying that they're louder than what they wanted Link to comment Share on other sites More sharing options...
Brett Posted May 9, 2013 Share Posted May 9, 2013 What tuner. There are lots of "tuners" and not all of them are what I'd personally consider knowledgable. I know of several LGTs running 300+ AWHP on stock cans. Leaving a touch of power on the table... perhaps. 15WHP?? Dyno plots or GTFO, or as the almighty TurboDog says, "back it up or retract!" lol turbodog also recommends no tune with an aftermarket dp. along with cut springs Link to comment Share on other sites More sharing options...
700watts Posted May 9, 2013 Share Posted May 9, 2013 Ok, the quietest system around and what I did is this......run completely open to stock resonator and mufflers......I would suggest replacing the Y-pipe as well…. Pro’s ..really quite Con’s…no cat smell.. I’m working on that, may go with high flow cat Link to comment Share on other sites More sharing options...
I Donated thefultonhow Posted May 9, 2013 I Donated Share Posted May 9, 2013 Ok, the quietest system around and what I did is this......run completely open to stock resonator and mufflers......I would suggest replacing the Y-pipe as well…. Pro’s ..really quite Con’s…no cat smell.. I’m working on that, may go with high flow cat Right, that's quiet, but it's a low-flow setup too. Link to comment Share on other sites More sharing options...
700watts Posted May 9, 2013 Share Posted May 9, 2013 it's good for 377hp and 385tq, tunner says I'll be around 400 if a go for a better exhaust setup..it's fast enough Link to comment Share on other sites More sharing options...
05pearl Posted May 9, 2013 Share Posted May 9, 2013 There is a guy here in CO with just a dp and stock exhaust (as for exhaust mods) making really nice power just running E85, Cryo I think - and he tunes. If I had to do it all over again, that't the set up I would go with. A nice sleeper set up. Link to comment Share on other sites More sharing options...
I Donated thefultonhow Posted May 9, 2013 I Donated Share Posted May 9, 2013 it's good for 387hp and 395tq So you're running the stock VF40, right? It's really pointless to say that without knowing what your other mods are... Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted May 9, 2013 Moderators Share Posted May 9, 2013 it's good for 377hp and 385tq, tunner says I'll be around 400 if a go for a better exhaust setup Are you pushing those numbers and living in Vienna? I can haz ride, please? "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
700watts Posted May 9, 2013 Share Posted May 9, 2013 sure can...swing through for a beer if you want HTA68 JE pistons can't remember the compression ratio.....I did up it Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted May 9, 2013 Moderators Share Posted May 9, 2013 sure can...swing through for a beer if you want I'll have to do that sometime! "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
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