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Old May 4, 2008 | 03:47 PM
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Default Exhaust pipe size

I need to order some pipe so I can start building my exhuast but I don't know what size I should run. I'm going to Y into a single exhaust/single muffler out the back. It's a street car, so I don't need it too obnoxious. I'm thinking 2.5" off the headers into dual cats y'ed into a single 3" out to a muffler.
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Old May 4, 2008 | 03:47 PM
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Oh yeah, and these are the headers I'm going to try and make work. http://store.summitracing.com/partde...?part=BBK-4003
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Old May 5, 2008 | 05:38 PM
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Have you test fit those headers in the car? Seems from the picture they may be pointed a bit too far back to clear the steering on the 240.
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Old May 6, 2008 | 08:06 AM
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Originally Posted by rigid
Have you test fit those headers in the car? Seems from the picture they may be pointed a bit too far back to clear the steering on the 240.
I have not, I haven't even ordered them yet. I know they won't fit without modification, but they seem like the easiest to get to work for me right now.
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Old May 6, 2008 | 10:21 AM
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3" is ok, 3.5" would probably be the best.
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Old May 6, 2008 | 10:34 AM
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3" will work fine. car the motor came from ran 2.75 out the back so 3" should be sufficient
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Old May 6, 2008 | 01:28 PM
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Originally Posted by andrew69_04
3" will work fine. car the motor came from ran 2.75 out the back so 3" should be sufficient
Will it sound ok though? I know single exhaust isn't going to sound the greatest, but I don't want it to sound like ****.
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Old May 6, 2008 | 03:55 PM
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Depens on what mufflers,resonators etc... you go with. 3' will be fine for mild modding however if you plan on going all out later go with a 3.5in, As for your header isssue, Id say buy a kit and do them yourself.
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Old May 6, 2008 | 10:11 PM
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As it is now I would do a 2 1/2 to 3" exit y-pipe.
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Old May 7, 2008 | 08:10 AM
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Well I'm having trouble finding a 2.5" to 3" stainless y-pipe. Anyone have a link?
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Old May 7, 2008 | 08:54 AM
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http://www.jegs.com/p/Flowmaster/744773/10002/-1/11535
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Old May 7, 2008 | 10:31 AM
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Yeah I saw them, but I don't see anywhere that states they are stainless so I assumed they aren't.
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Old May 7, 2008 | 01:00 PM
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Burns Stainless should have whatever you want. They are a pricey though. If you are building the rest of the system then you might want to take a shot at making a y-pipe yourself. It's not too hard at all and assuming it turns out well it'll give you the confidence to get more adventurous with your fab skills later on.
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Old May 7, 2008 | 01:05 PM
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spd exhaust may have it cheaper than burns, also. some things they are worse, others they are better.

its real easy to make a nice Y pipe, IMO. you should try it.
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Old May 7, 2008 | 05:16 PM
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Originally Posted by Skele4door
Burns Stainless should have whatever you want. They are a pricey though. If you are building the rest of the system then you might want to take a shot at making a y-pipe yourself. It's not too hard at all and assuming it turns out well it'll give you the confidence to get more adventurous with your fab skills later on.
+1 built my y-pipe for my other car turned out great, Since your doing a ls1 conversion, im pretty sure you have the fab skills neccesary to build your own y-pipe
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Old May 7, 2008 | 08:14 PM
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I got a dual 2.5 to 3 from summit. Part number was MPE-10778. Its not really optimized for flow in anyway but it is stainless and only $27.
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Old May 7, 2008 | 08:58 PM
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those headers are gonna take a lot of work to make fit. i used hooker block huggers and made them work. im actually gonna be selling them in a few weeks if youre interested. only downside is they arent stainless but they sure as hell have a good coating on them because i havent had any issues with it and ive heated em up pretty good
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Old May 7, 2008 | 08:59 PM
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Originally Posted by rigid
I got a dual 2.5 to 3 from summit. Part number was MPE-10778. Its not really optimized for flow in anyway but it is stainless and only $27.
That's what I was looking for. I hate navigating summit's site.
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Old May 7, 2008 | 09:01 PM
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Originally Posted by Kamin
those headers are gonna take a lot of work to make fit. i used hooker block huggers and made them work. im actually gonna be selling them in a few weeks if youre interested. only downside is they arent stainless but they sure as hell have a good coating on them because i havent had any issues with it and ive heated em up pretty good
I've already ordered them. If I don't think I can make them fit reasonably easily I'll just return them. I have a set of 99 vette manifolds which are similar to the hooker block huggers but they won't work.
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Old May 7, 2008 | 09:27 PM
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The hooker block huggers are like $209 from summit(i have those sitting here as well). I made sure I had a huge list of stuff to get from summit considering shipping there is only $11 no matter how much you order.
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