mightyS Posted January 9, 2005 Share Posted January 9, 2005 My neighbor parked his new Grand AM Gt beside my Legacy GT and I noticed it also had dual exhaust ports in the back. I got under the car to see the Grand AM has 1 muffler but has 4 exahust pipes (2 very short, 2 curve around to the right side). It seems that the 2 pipes on the right are just for show. Most of the exhaust will go out the short pipes. The Legacy has 1 exhaust pipe that splits to 2 mufflers and 2 wide pipes. The WRX just has 1 pipe in the back. Does the Legacy produce so much exhaust that it needs 2 mufflers and pipes to reduce the backpressure, or is it just for looks? Link to comment Share on other sites More sharing options...
Jedi Pimp Posted January 9, 2005 Share Posted January 9, 2005 Just for looks.... Link to comment Share on other sites More sharing options...
SubaruFlamingo Posted January 9, 2005 Share Posted January 9, 2005 Doesn't it help the engine breath easier? I agree that its mainly there for looks, but you don't think it gets a few extra HP through it? Actually if I remember correctly, the LGT does have a true dual exhaust system... Link to comment Share on other sites More sharing options...
DeepFreeze2 Posted January 9, 2005 Share Posted January 9, 2005 Actually a true dual exhaust is separate from each bank of cylinders. The GT's exhaust is split at/after the rear axle. YA RLY!!! Home of +2500 useless posts!!!! Link to comment Share on other sites More sharing options...
GaryS Posted January 9, 2005 Share Posted January 9, 2005 It will flow well, like a big single, but keep the noise to a minimum for a more refined (some say, too much so) experience. Link to comment Share on other sites More sharing options...
axis008 Posted January 9, 2005 Share Posted January 9, 2005 Correct me if I'm wrong (since I'm a newbie at this, too), but you can create more power with just one pipe, since there are less restrictions (like the split in the Y-piping). -ben Link to comment Share on other sites More sharing options...
LeGreatOne Posted January 9, 2005 Share Posted January 9, 2005 If you have two banks of cylinders as the Flat four does, it's easy enough to use a separate exhaust header per bank. It's actually simpler to do this than to run separate header pipes together and use a single long exhaust pipe. As to how power is affected, less restriction is provided with straighter pipe and with a larger diameter pipe. I'm a sports car fan, but I'm not a noise fan and would prefer NOT to make unnecessary sound that draws the attention of the highway patrol. Give me a quieter, but still functional, exhaust any day. I have an aftermarket stainless 2.5 inch single pipe exhaust and 2.5 inch free flow cat on my FM 2 turbo Miata, but I added a 2.5 inch resonator to make the drive bearable with the top up. When I was younger, I liked the Brrrrp-Brrrp rumble of my MG, but when one matures and has a LONG commute, that pleasant exhaust rumble becomes torture. We are inundated with noise from EVERYWHERE nowadays, so I personally prefer a quieter driving environment. If you don't like a quiet exhaust now, just wait a few years... I think you'll come to appreciate it Link to comment Share on other sites More sharing options...
Guest turboman Posted January 9, 2005 Share Posted January 9, 2005 Cat.converters are very expensive and if you ran two separate, full length, independent pipes you would need twice as many converters. Lots of additional expense to manufacture for a gain that 95% of the owners would never notice or appreciate. If an owner appreciates the "dual" differences he can go to a muffler shop or do it himself. Link to comment Share on other sites More sharing options...
frontrangeSubie Posted January 9, 2005 Share Posted January 9, 2005 Dual Exhaust on a 4 cylinder? Looks. Link to comment Share on other sites More sharing options...
LeGreatOne Posted January 9, 2005 Share Posted January 9, 2005 Actually, aftermarket free-flow cats aren't nearly as pricey as stock restricted (but more effective) catalysts are. The FM 2.5 inch free flow cat on my miata was only about $180 new. Link to comment Share on other sites More sharing options...
Mono Posted January 9, 2005 Share Posted January 9, 2005 I rather it had a single exhaust. The dual is just for looks. It's a common trend these days on cars that simply don't need duals. If your going to do a dual exhaust, then do it correctly. Don't run a single pipe to the rear and then split it again. No thanks. Link to comment Share on other sites More sharing options...
LeGreatOne Posted January 9, 2005 Share Posted January 9, 2005 I don't know... I see nothing wrong with a styling element that adds balance. Besides, if one used a larger diameter single pipe, the duals at the rear would become more functional. Is it necessary? No... Does it look good? Yes. Cars are sold not just on their ability to move, but also on their styling. They have to have something about them that entices a buyer to unlock his wallet or her purse. Styling has always been a key. Car makers don't always get things right. As an example, I dislike the placement of the intercooler atop engines which necessitates a bulge and scoop on the hood. However, AMERICAN muscle cars used a scoop and so it became an important styling element. Personally, I like stealth. Give me no attention grabbing doo-dads like scoops or spoilers and I'll be happy. Link to comment Share on other sites More sharing options...
dennis72 Posted January 9, 2005 Share Posted January 9, 2005 I am not sure but I guess the longer exhaust will work in low rpm for more torque and the shorter exhaust will work in high rpm for more hp Link to comment Share on other sites More sharing options...
2Simpletons Posted January 9, 2005 Share Posted January 9, 2005 Typically the dual exhausts would be harmonically tuned (ie 350Z, FX400 or whatever) but Suby doesn't liked "loud" factory exhaust. Link to comment Share on other sites More sharing options...
DeepFreeze2 Posted January 9, 2005 Share Posted January 9, 2005 I'm no expert, by any stretch of the imagination, but I would guess that 1 larger, straight pipe would have a flow advantage over the stock set up. What is the best size for a "balanced" exhaust if going with the single pipe? YA RLY!!! Home of +2500 useless posts!!!! Link to comment Share on other sites More sharing options...
John M Posted January 9, 2005 Share Posted January 9, 2005 The Grand Am's exhaust is for looks, as evidenced by the single muffler and 4 tips. Our exhaust provides a useful function. A car with two mufflers can use more restrictive but quieter units that will together provide the flow of one loud muffler with half the noise. We get the best of both worlds here. How good is having 2 mufflers? My Stealth's stock exhaust supported up to 115 mph traps - just a downpipe was all it needed. Only after that was an aftermarket setup beneficial. Link to comment Share on other sites More sharing options...
lemming Posted January 9, 2005 Share Posted January 9, 2005 take a look at the e46 "twin dual" exhaust. it's a humongous muffler with four outlets. Link to comment Share on other sites More sharing options...
twisted Posted January 10, 2005 Share Posted January 10, 2005 well the LGT wont be thw first 4cyl with dual exhaust. TSX S-2000 ...oh wait they are honda products...they dont count !!!! Link to comment Share on other sites More sharing options...
NonovUrbizniz Posted January 10, 2005 Share Posted January 10, 2005 Dual mufflers are just so they can charge you more for replacements... the dual tip single muffler systems probobly flow better. splitting the pipe that far back is NOT good for performance period...it'll reduce sound... but that's about it. Dual exhaust is only benificial if its not completely seperate... you NEED a cross pipe behind the header or cat to even out the gas flows between the two systems. Think of it this way... 3.0+ I6's almost ALL use single exhuast... even if they use 2 seperate exhaust manifolds... even lots of v6 guys convert to single exhaust for better flow... it'll be louder but it's going to flow better coming out of a single larger diameter pipe... BMW M3's saw a big increase in power when they went from dual piping from the headers back to single piping... people with the older dual set up OFTEN buy the single set up and see good gains. Link to comment Share on other sites More sharing options...
Guest JessterCPA Posted January 10, 2005 Share Posted January 10, 2005 The Grand Am's exhaust is for looks, as evidenced by the single muffler and 4 tips. You mean there is something on a Pontiac just for looks?? Not functional?? GASP!! Link to comment Share on other sites More sharing options...
Drift Monkey Posted January 10, 2005 Share Posted January 10, 2005 You mean there is something on a Pontiac just for looks?? Not functional?? GASP!! UNpossible!!1 0h n0s!111 Link to comment Share on other sites More sharing options...
Guest JessterCPA Posted January 10, 2005 Share Posted January 10, 2005 These HAVE to be functional. Just look at them! http://img.photobucket.com/albums/v228/bonnealien/000_0227.jpg Link to comment Share on other sites More sharing options...
Drift Monkey Posted January 10, 2005 Share Posted January 10, 2005 These HAVE to be functional. Just look at them! http://img.photobucket.com/albums/v228/bonnealien/000_0227.jpg OMFG!!1 Link to comment Share on other sites More sharing options...
BoxerGT2.5 Posted January 10, 2005 Share Posted January 10, 2005 It's missing the number "3" decal in one of the windows. OBAMA......One Big Ass Mistake America! Link to comment Share on other sites More sharing options...
Drift Monkey Posted January 10, 2005 Share Posted January 10, 2005 Just for looks.... It's just fo decorations! It's just for decoration, man, s'only for decoration. That's it and that's all. We do it for decorations. Link to comment Share on other sites More sharing options...
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