svx6 Posted August 7, 2006 Share Posted August 7, 2006 So I did a search here and it seems like all of the downpipes taper back down to 2.5 inches to mate to the stock exhaust system. Are there any around that have a 3" outlet...I was thinking about going 3" piping custom piping from turbo to the tailpipes. Would I be better off just getting one of the downs that has a 2.5" outlet and having it cut, and then having a 2.5" adapter handy if I ever decided to go back to stock exhaust system? Gets confusing after a while... thanks in advance, Syd Link to comment Share on other sites More sharing options...
GTurabus Posted August 7, 2006 Share Posted August 7, 2006 The non-existent and never to be produced Helix downpipe was to have such specs. Because it was rumored to have such a great price I was waiting for it. I will probably go with the Autospeed downpipe, as it does exist and is at least reasonable in price. Lachute describes having both a 2.5 inch and 3 inch flange, but I cannot find on their website the actual pipe dimensions, also a little pricey, even factoring a Canadian conversion. Perrin does have a catless 3" FTW or FTL, depending on your point of view. I'm not sure about the AVO specs, but if you've got the money . . . Just trying to boost my post count. I believe I'm the most senior "new member" by a longshot. Link to comment Share on other sites More sharing options...
nekdut Posted August 7, 2006 Share Posted August 7, 2006 PDE has a full 3" outlet, with a 2.5" reducer welded in to mate with the stock catback. You can remove this reducer and you will have a full 3" flat flange to connect to real full length 3" catbacks. Actually, mine will be for sale shortly as it wont work with the direction I will be going with the car in the near future . Link to comment Share on other sites More sharing options...
mickeyd2005 Posted August 8, 2006 Share Posted August 8, 2006 Here is an explanation from PDE. Not that I agree or understand... I think it means that you need some kind of expansion joint here and that a custom joint isn't worth the HP gains. PDE :: CREATIVITY | PERFORMANCE | VALUE Link to comment Share on other sites More sharing options...
Speedracerx Posted August 8, 2006 Share Posted August 8, 2006 Most of the WRX units are 3". APS makes a 3" or 3.5" with optional HFC insert. If you going custom catback, then any WRX/STi DP should work fine. I'm using my old Turbo XS 4"DP (3" outlet) with a turbo XS 3" HFC and 3" custom piping to the tailpipes (http://legacygt.com/forums/intake-exhaust/40436-my-stealth-dual-exhaust.html). Works fine! I kept the stock system so I can change back at any time. Link to comment Share on other sites More sharing options...
nekdut Posted August 8, 2006 Share Posted August 8, 2006 Here is an explanation from PDE. Not that I agree or understand... I think it means that you need some kind of expansion joint here and that a custom joint isn't worth the HP gains. PDE :: CREATIVITY | PERFORMANCE | VALUE You dont need any thing fancy. Basically the pipe is 3" all of the way, and at the flange, it has a reducer welded in with a spot for the donut gasket to sit. When you want to use it with a full 3" catback, just cut the reducer out. Link to comment Share on other sites More sharing options...
Spinjockey Posted August 8, 2006 Share Posted August 8, 2006 The non-existent and never to be produced Helix downpipe was to have such specs. Because it was rumored to have such a great price I was waiting for it. I will probably go with the Autospeed downpipe, as it does exist and is at least reasonable in price. Lachute describes having both a 2.5 inch and 3 inch flange, but I cannot find on their website the actual pipe dimensions, also a little pricey, even factoring a Canadian conversion. Perrin does have a catless 3" FTW or FTL, depending on your point of view. I'm not sure about the AVO specs, but if you've got the money . . . I think the AVO has a 3" tubing the whole way with a 2.5" opening (don't think there's a slip fit). However given the price and the cat location you're probably better off elsewhere. If I have problems in 5 years with CA emissions I'll consider it. I think the Lachute pieces are made to order. Link to comment Share on other sites More sharing options...
rexster Posted August 8, 2006 Share Posted August 8, 2006 helix is releasing one some day... http://legacygt.com/forums/vendor-announcements/27803-helix-legacy-downpipe-8-a.html Link to comment Share on other sites More sharing options...
AutoSpeed Performance Posted August 8, 2006 Share Posted August 8, 2006 Our Downpipes are a bellmouth with full 3" piping they are available in-stock and ready to ship. Frank ASP Link to comment Share on other sites More sharing options...
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