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Old 03-30-2010, 09:22 AM
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Wink My 3in exhaust, from down pipe too magnaflow







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Old 03-30-2010, 09:23 AM
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Wink More pics *finished*







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Old 03-30-2010, 09:32 AM
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Pretty 3" pipe. So, in the second to last pic does it go from 3" to 2.5"? Looks like a bit of a bottle neck to me...
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Old 03-30-2010, 01:27 PM
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yep it does drop from 3in to 2.5, I was informed by him that from that distance there isn't any loss, being that from that far back its pretty much a exit and wouldn't interfere with the flow whats, you opinion on this? should i do something before i get the Evo turbo and intercooler and intake and accessport, or will this setup on the exhaust ruin my tune?

Last edited by 2010 Rallihead Sportback; 03-31-2010 at 02:29 PM.
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Old 03-30-2010, 02:46 PM
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If it were me, putting in a 3" exhaust pipe, I would make the effort to have my exhaust 3" all the way. This should actually start on the intake side of things - trying to keep the same diameter. I am not basing this on technical proof, rather personal preference. Your exhaust guy might be correct, but without dynoing a before/after run with your current exhaust vs a 3" exhaust, its hard to say for sure. Still, the purest in me says that if I'm going to the trouble to running a 3" all the way from the turbo to the exhaust, it better be a 3" dia. all the way.
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Old 03-30-2010, 08:09 PM
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No matter how you look at it, from 3" to 2.5" is a bottle neck.
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Old 03-31-2010, 08:23 AM
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whats the stock size of the the exhaust??? 2.5??
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Old 03-31-2010, 09:21 AM
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It's like running a baffle or a resonator. It will negate most of the power gains from the larger diameter exhaust.

To say there's no affect on power in that short distance is fraudulent to say the least. My exhaust is 80mm all the way through. But would you suppose placing a 2" silencer at the tip would have no affect?

You're losing about 10WHP. I'd ask him to finish the job or take it to a more performance oriented shop.
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Old 03-31-2010, 01:45 PM
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"It's like running a baffle or a resonator. It will negate most of the power gains from the larger diameter exhaust."

wait a sec how does a resonator negate power.. its just to quiet down the sound, like a mini, only without the negative impact...

Last edited by 2010 Rallihead Sportback; 03-31-2010 at 02:28 PM.
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Old 03-31-2010, 02:27 PM
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I just came back from the shop, he said there's no problems because its a free flow system, there's no chambers and no baffles to restrict the flow, but he did understand what are discussion was about and said the only problem if any would be from the inlet of the muffler,(what we've talked about being the bottleneck) but the problem would be the room to turn the piping to the muffler since were talking about 3in's here and also magnaflow doesn't make it in the same setup as i have it (sad face) but there's no out let issues obviously cause i have (2)2.5 outlets
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