Deer Killer Posted August 12, 2004 Share Posted August 12, 2004 [quote name='Dr. Zevil']I remember reading something way back when about how the GT's exhaust was specifically designed for maximizing torque. Now, there is a whole debate on whether or not turbo'd cars gain any torque benefits from back pressure. I don't intend to start this debate, but I do put some faith in Subaru engineers when it comes to these boxer engines. We will only really know once someone dyno's a prototype turboback, downpipe, or catback systems. It's a little early for this.[/quote] It's not back pressure, it's the resonance of the pipe that helps move the exhaust along at certain frequencies, and not at others. Think of it like a guitar string. By changing the length and tension you can change which frequencies are reinforced. You need an engineer that has a good grip on 2nd/3rd year college physics. I don't really trust tuners to do that. Link to comment Share on other sites More sharing options...
Dr. Zevil Posted August 12, 2004 Share Posted August 12, 2004 Yup, that's it.. I am always a fan of "revisionist history" :lol: Link to comment Share on other sites More sharing options...
MBDarkwinter Posted August 19, 2004 Share Posted August 19, 2004 from what I have seen in honda forums, running a single big pipe from the header back gets you better power on a turbo 4 banger. The legacy exhaust seems to be mostly for the sound and the look. I have a big International Scout II with a 304 v8 and I have a pipe on each header going all the way back, with no equalizing X pipe of H pipe. If you look at the piping on the new GTO it has an x-pipe with header back true dual exhaust. so, the legacy does not have dual exhaust, it just has dual tips. It would be difficult and totally unnecessary to have true dual exhaust on a single turbo car. Have you ever seen dual exhaust on any big turbo diesel trucks...no because you dont need it. but on the Legacy it does look damn cool Link to comment Share on other sites More sharing options...
meier motor sports Posted August 19, 2004 Share Posted August 19, 2004 [quote name='MBDarkwinter'] Have you ever seen dual exhaust on any big turbo diesel trucks...no because you dont need it. but on the Legacy it does look damn cool[/quote] just about every time i pass a semi i see a big diesel truck with duel exhaust! :lol: Link to comment Share on other sites More sharing options...
Whitestar Pilot Posted September 1, 2004 Share Posted September 1, 2004 After looking it over in my garage, I'd have to say the car would be faster if Subaru had just routed one larger pipe all the way back from the cat to one high flow muffler on the driver side. This would have reduced weight and improved flow. The way it is, it looks great to the spectator in the car behind you, but for optimal performance, its a waist. Link to comment Share on other sites More sharing options...
SUBE555 Posted September 1, 2004 Share Posted September 1, 2004 Yes it might be optimal, but it would also be louder, and for the amount they'd gain (minimal with ECU tuning), it's worth it for a manufacturer to have a quieter car. Link to comment Share on other sites More sharing options...
Drift Monkey Posted September 3, 2004 Share Posted September 3, 2004 By the way I made a sound clip with the mufflers off yesterday... I'll post it later....:twisted: Link to comment Share on other sites More sharing options...
D-2.5-GT Posted September 3, 2004 Share Posted September 3, 2004 [quote name='Drift Monkey']By the way I made a sound clip with the mufflers off yesterday... I'll post it later....:twisted:[/quote] did you put a new exhaust on or something? Link to comment Share on other sites More sharing options...
Drift Monkey Posted September 3, 2004 Share Posted September 3, 2004 [quote name='D-2.5-GT'][quote name='Drift Monkey']By the way I made a sound clip with the mufflers off yesterday... I'll post it later....:twisted:[/quote] did you put a new exhaust on or something?[/quote] Um...I did exactly what I said, made a sound clip with the mufflers off....and with the DP unbolted. Just bored I guess... :P :lol: Link to comment Share on other sites More sharing options...
Drift Monkey Posted September 5, 2004 Share Posted September 5, 2004 Sound clips as promised (sorry they're kinda crappy): Downpipe unbolted (behind 3rd cat) - [url]http://www.di-links.com/uploads/mvi_0106.mp3[/url] Mufflers undone: [url]http://www.di-links.com/uploads/mvi_0107.mp3[/url] The boxer burble lives! :twisted: Link to comment Share on other sites More sharing options...
Th3Franz Posted September 5, 2004 Share Posted September 5, 2004 Links not working? -Franz The end of a Legacy http://www.youtube.com/th3franz Link to comment Share on other sites More sharing options...
Drift Monkey Posted September 5, 2004 Share Posted September 5, 2004 [quote name='Th3Franz']Links not working?[/quote] Works now. :P Link to comment Share on other sites More sharing options...
axis008 Posted September 5, 2004 Share Posted September 5, 2004 Thanks for posting DM! It's music to my ears! :D -ben Link to comment Share on other sites More sharing options...
Th3Franz Posted September 5, 2004 Share Posted September 5, 2004 Oh man it makes me want a more aggressive catback on my car... :D The 2nd one still has the resonator in place correct? -Franz The end of a Legacy http://www.youtube.com/th3franz Link to comment Share on other sites More sharing options...
Drift Monkey Posted September 6, 2004 Share Posted September 6, 2004 [quote name='Th3Franz']Oh man it makes me want a more aggressive catback on my car... :D The 2nd one still has the resonator in place correct?[/quote] Correct, just the 2 mufflers unbolted. Link to comment Share on other sites More sharing options...
Guest *Jedimaster* Posted September 6, 2004 Share Posted September 6, 2004 Sounds pretty mean DM- so when are you going to eliminate the resonator and post a clip so I don't have to be the first one to hack mine up? ;) Link to comment Share on other sites More sharing options...
jdmpartstx Posted November 3, 2004 Share Posted November 3, 2004 [quote name='irunfromcops']if the exhuast split closer to the turbo (ie: before the cat) there would have to be 2 catalytic converters which are not cheap.[/QUOTE] Um...the LGT has 3 catalytic converters. 1 in the uppipe, 1 in the downpipe and 1 after the downpipe. As already stated, a true dual exhaust would be impossible without twin turbos. An ideal setup for this car (for street use) would be a single pipe from the turbo all the way out the back with 1 exit. Link to comment Share on other sites More sharing options...
chucktoo Posted November 3, 2004 Share Posted November 3, 2004 Sounds like an STI to me . Link to comment Share on other sites More sharing options...
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