Generation III Internal Engine 1997-2006 LS1 | LS6

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Old

Oct 1, 2012 | 12:15 AM

#1

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LS1 manifold

I have a 2001 Firebird and I was wondering if anyone knows if it comes with a ls6 90mm manifold? I bought a fast 102mm but do I really need it if it has the ls6 manifold already on it.

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Oct 1, 2012 | 12:34 AM

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From: Bowling Green KY

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It should have shipped with an LS6 intake, but a 78mm TB, I believe is standard on those. It is definatly not a 90mm, those have 4 bolts, not 3 like yours should have. I wouldn't bother with a 102 unless you have heads and cam to go with it.

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Oct 1, 2012 | 02:11 AM

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From: Chillicothe/Lima, Ohio

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If you already have the 102, put it on. You will see a solid 25 HP gain now and it will leave you room to grow down the road

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Oct 1, 2012 | 03:01 AM

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ok so would I actually be losing 25hp if i eventually do heads and cams and put on a 90mm throttle body?

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Oct 1, 2012 | 04:03 AM

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A 90 mm on your stock intake would be pointless.

On a decent heads/cam car, the entire 102 setup has gained 35+ over an ls6 intake and tb.

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