with an HO manifold you should gain anywhere from 10 to 15 horses. some people have been gaining up to 20 with the RSM. Personally I like the design of the RSM IM.
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I have the HO mani with the stock 2.4 tb, I felt a difference but not enough to tell you to go out and get one right away. I have a turbo kit ready to be installed and that was the main reason I went with the HO mani because I just think it looks a lot cleaner. Also I heard that all RSM does is port out the lip on the stock mani, some thing you can do with a dremel tool your self.
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well if you do the tb first then you have to pull the intake mani off and port out the lip. but you can do either one first or do both at the same time. I used the the stock 2.4 bracket as well for the tb.
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20hp from the RSM intake manifold. hahahahahahahahahaha................ maybe 5hp if that. All the RSM intake manifold is, is ported at the top where the TB is attached to allow you to put on a large TB like there 62mm TB. I would go with the HO manifold.
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HO is a great manifold. A guy here in town that I know has one on his sunfire GT and it was a good upgrade. I think he paid 150 for the whole setup, and it is definitely worth that much!!!!!
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