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Old Jun 25, 2008 | 07:43 PM
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need headers!!!!!! anyone know if there are headers out for the 350 yet except for the mazzuri
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Old Jun 25, 2008 | 08:54 PM
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No. There are none. They're also illegal in California.
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Old Jun 26, 2008 | 10:30 AM
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Don't forget about the JUN-TW headers. They still aren't legal though.
http://www.l-tunedparts.com/product/?id=2673
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Old Jun 26, 2008 | 11:30 AM
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Originally Posted by Gernby
Don't forget about the JUN-TW headers. They still aren't legal though.
http://www.l-tunedparts.com/product/?id=2673
My understanding was they're also not for the IS350.

They'll physically FIT an IS350... but their nation of origin only gets the IS250 and that is the engine for which they are designed (as in the size of the plumbing and whatnot is meant for the 250s engine so results on the 350 engine are unknown at best)
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Old Jun 26, 2008 | 12:08 PM
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I might have it backwards, but if I remember correctly, the size of the primaries and collector actually favors the 350 more than the 250. I can't remember which thread this was discussed in, but I'm pretty sure it was Mazzuri that mentioned the diameters of the plumbing being better for the 350 than 250.
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Old Jun 26, 2008 | 12:50 PM
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Originally Posted by Gernby
I might have it backwards, but if I remember correctly, the size of the primaries and collector actually favors the 350 more than the 250. I can't remember which thread this was discussed in, but I'm pretty sure it was Mazzuri that mentioned the diameters of the plumbing being better for the 350 than 250.
In my case I don't have the tooling to bend anything smaller than 1.5" which is a good size for the 350, not the 250... which needs to be around 1.3". I have no idea what the size of the Ju headers is.
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Old Jun 26, 2008 | 01:24 PM
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Originally Posted by mazzuri
In my case I don't have the tooling to bend anything smaller than 1.5" which is a good size for the 350, not the 250... which needs to be around 1.3". I have no idea what the size of the Ju headers is.
There was a thread about the Megan headers having a 1.75" primary diameter and that this would be too big for a street car. Maybe that is where it all started.
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Old Jun 27, 2008 | 12:00 PM
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anyone have the jun headers?
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Old Jun 28, 2008 | 03:28 AM
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Originally Posted by mazzuri
In my case I don't have the tooling to bend anything smaller than 1.5" which is a good size for the 350, not the 250... which needs to be around 1.3". I have no idea what the size of the Ju headers is.

forgive the ignorance but with that said, isnt it weird that your the 250 headers made bigger gains than the 350 ones?
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Old Jun 28, 2008 | 09:40 AM
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Originally Posted by ndk83
forgive the ignorance but with that said, isnt it weird that your the 250 headers made bigger gains than the 350 ones?
It's not weird, just unexpected. Torque wise the 350 made a bit more, hp wise the 250 made more.
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Old Jun 28, 2008 | 09:42 AM
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^^My guess is since the 250 has a higher C/R it makes more HP.
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Old Jun 28, 2008 | 11:27 AM
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Originally Posted by mazzuri
It's not weird, just unexpected. Torque wise the 350 made a bit more, hp wise the 250 made more.
??? Horsepower is mathematically derived from torque. How could you make more torque and NOT make more horsepower?
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Old Jun 28, 2008 | 02:21 PM
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why won't these headers pass emissions???? for 350
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Old Jun 28, 2008 | 02:48 PM
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They eliminate the primary cats.
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Old Jun 28, 2008 | 03:43 PM
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Originally Posted by lobuxracer
??? Horsepower is mathematically derived from torque. How could you make more torque and NOT make more horsepower?
Your right. I am talking about peak numbers, which everyone seems to only care about.
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