datsun723 Posted July 29, 2008 Share Posted July 29, 2008 He has an L28 not L28T no, i checked his public profile. he has a l28et...and he shouldn't get twice pipes lol. Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted July 29, 2008 Author Share Posted July 29, 2008 You can order the twice pipes for various msa headers. It gives you the option when you order them. I wouldn't think you would benifit from this exhaust if you were turbo.. the pipes are quite small. Probably to much backpressure but would sound good im sure. Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted July 29, 2008 Author Share Posted July 29, 2008 no, i checked his public profile. he has a l28et...and he shouldn't get twice pipes lol. Hes talking about me Link to comment Share on other sites More sharing options...
datsun723 Posted July 29, 2008 Share Posted July 29, 2008 oh, haha. of COURSE he was talking about you i knew that... Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted July 30, 2008 Author Share Posted July 30, 2008 I bought my whip off him hehe Link to comment Share on other sites More sharing options...
Challenger Posted July 30, 2008 Share Posted July 30, 2008 MJLAMBERSON has a L28et! He shouldnt put twice pipes on his motor. It would probably sound like crap and be of no benefit. Thats what I was talking about not knuckleduster. Link to comment Share on other sites More sharing options...
datsun723 Posted July 30, 2008 Share Posted July 30, 2008 yea i was talking about the same thing challenger was.... personally, i love the rumble of the l28et through a 3'' and no muffler. like big phil's, or his buddy chris's...thw tice pipes are nice but i can't wait for the day when i can do a turbo swap Link to comment Share on other sites More sharing options...
Challenger Posted July 30, 2008 Share Posted July 30, 2008 Ill sell you the harness and fuel rail.. Link to comment Share on other sites More sharing options...
Daeron Posted July 30, 2008 Share Posted July 30, 2008 why would these so-called "twice pipes" be so significanlty different and awful sounding on a turbo motor?? They just split the exhaust up into two pipes beyond a certain point; even without the turbo in line the system comes from MSA to attach to a single pipe, the front most piece in the kit as sold is a Y pipe that splits the exhaust into two.. "Twice Pipes" proper are a fully divorced exhaust system, usually used on V engines, with one pipe per cylinder bank. "Proper twice pipes" on an L-6 would group 1, 2, and 3, and 4,5, and 6, each into one of two separate pipes all the way back through the exhaust. THIS type of setup is the one subject to the infamous power loss through loss of exhaust pulse scavenging..BUT, regarding THAT issue, it takes a specifically engineered head-pipe (read: engineered to your specific block, not engineered to some mass-produced L-esries standard) to REALLY take proper ADVANTAGE of the exhaust pulse scavenging anyhow. My point is.. what difference is there between an exhaust system that exits the turbo downpipe, into a splitter, and then runs two pipes back to two outlets on the car; and an exhaust system that runs downpipe, through one pipe, into a muffler that has two exits?? We must keep in mind that the MSA Twice Pipes Exhaust System is "twice pipes" in name only; it is a SLIGHTLY mis-applied name, and as a result everyone thinks all these things about the system. I'm sure it would sound different from the norm on a turbo motor; I can't quite explain away the difference it makes in the sound of an NA (even though I just posted an argument saying that from the technical side of things, it is essentially identical to a standard exhaust system) so I can understand that the sound might be something one could consider AWFUL.. is that the biggest reason that you recommend against it? Link to comment Share on other sites More sharing options...
datsun723 Posted July 30, 2008 Share Posted July 30, 2008 hmm....very good points there. i guess my argument would be that although the Y pipe is 2.5'' the two separate pipes are only 2'' i believe. maybe smaller. i just don't know if it would flow as well as a regular 2.5 or 3'' turbo back system... who wants to try it out? Link to comment Share on other sites More sharing options...
datsun723 Posted July 30, 2008 Share Posted July 30, 2008 Ill sell you the harness and fuel rail.. unfortunately being a college kid has it's financial limits lol. the turbo swap wouldn't be for another 4-5 years....that and the head was rebuilt recently =P Link to comment Share on other sites More sharing options...
Daeron Posted July 30, 2008 Share Posted July 30, 2008 hmm....very good points there. i guess my argument would be that although the Y pipe is 2.5'' the two separate pipes are only 2'' i believe. maybe smaller. i just don't know if it would flow as well as a regular 2.5 or 3'' turbo back system... who wants to try it out? pi * r^2 = cross sectional area. 3 inch exhaust 3.14 * 1.5^2 = 7.065 sq in 2.5 inch exhaust 3.14 * 1.25^2 = 4.906 sq in 4 inch exhaust 3.14 * 2^2 = 12.56 sq in dual 2 inch exhaust 3.14 * 1^2 = 3.14 sq in times two pipes = ~6.25 sq inches. dual 2.25 inch exhaust 3.14 * 1.125^2 = 3.974 sq in times two pipes = ~ 7.95 sq inches. Dual 1.75 inch pipes are almost dead even (just a hair smaller) than a single 2.5 inch exhaust. With twin pipe exhaust systems, though, there is a greater surface area of pipe being lowed though, so to counter that you need to slightly increase cross sectional area.. Exactly how much increase is needed depends on the length of the pipe in question. So, in the end, a single 3" pipe is definitely higher flowing capacity than dual 2 inch pipes.. but the gain between dual 2" pipes over a single 2.5" is MUCH greater than the gain between 3" and dual 2", and dual 2.25" pipes are almost as much of a step ahead of a single 3 as the single 3 is ahead of the dual 2s. Link to comment Share on other sites More sharing options...
MJLamberson Posted July 30, 2008 Share Posted July 30, 2008 I dont get why two 2inch pipes doesnt flow as good as a four inch but Im young and inexperienced Link to comment Share on other sites More sharing options...
Challenger Posted July 30, 2008 Share Posted July 30, 2008 I dont think its as easy as the greatest surface area flows the best. I think theres more to it. Link to comment Share on other sites More sharing options...
datsun723 Posted July 30, 2008 Share Posted July 30, 2008 haha well, in 4 or so years when i get the swap done, i'll try the twice pipes and see what happens. and i agree...i think there's more to it. besides, if i'm going turbo i'd want want jus a straight through 3'' all the way back, no glass packs. call me crazy but i like my cars loud haha! Link to comment Share on other sites More sharing options...
zmaster Posted July 31, 2008 Share Posted July 31, 2008 did you have to purchase a new header to install the twice pipes.....or were you able to use the original header. i am now considering putting this system on my car. I am still wanting to either put a hks, or apexi n1 muffler on my z with a 3 inch mandrel bent exhaust system on my 280z.....I just want something unique, something no one else has. Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted July 31, 2008 Author Share Posted July 31, 2008 did you have to purchase a new header to install the twice pipes.....or were you able to use the original header. i am now considering putting this system on my car. I am still wanting to either put a hks, or apexi n1 muffler on my z with a 3 inch mandrel bent exhaust system on my 280z.....I just want something unique, something no one else has. You can order it to your specs. If it didn't end up working out an exhaust should can just install it for you around $100 Link to comment Share on other sites More sharing options...
datsun723 Posted July 31, 2008 Share Posted July 31, 2008 did you have to purchase a new header to install the twice pipes.....or were you able to use the original header. i am now considering putting this system on my car. I am still wanting to either put a hks, or apexi n1 muffler on my z with a 3 inch mandrel bent exhaust system on my 280z.....I just want something unique, something no one else has. no, you can use the stock header. it comes with a new Y pipe which goes into a 2.5'' collector and then out to the duals. you WILL howver, need to use the original gasket for the Y pipe. Link to comment Share on other sites More sharing options...
katman Posted July 31, 2008 Share Posted July 31, 2008 Keep this in mind- looks cool, sounds cool, but on anything close to a stock engine we always lost power with a dual setup compared to a single pipe when running 6-2 headers. And not a trivial amount either. Just a FYI.... Link to comment Share on other sites More sharing options...
JMortensen Posted July 31, 2008 Share Posted July 31, 2008 I dont get why two 2inch pipes doesnt flow as good as a four inch but Im young and inexperienced Draw a 4 inch diameter circle on a piece of paper, then draw two 2 inch diameter circles inside it. There is your answer. Link to comment Share on other sites More sharing options...
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