IS - 1st Gen (2001-2005) Discussion about the IS models up to the 2005 model

does is need any backpressure?

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Old 07-04-11, 09:24 PM
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Avarec
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Default does is need any backpressure?

wanna get headers and straight pipe my is

what size do you guys recommend 2.5 or 3 inch piping?
Old 07-04-11, 10:30 PM
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Are you boosted, or plan on it in the future?
- if yes, 3" with straight pipe is good for you.
- if no, 2.5" is plenty.

Are you concerned about mpg at all?
- if no, 3" with straight pipe is good for you.
- if yes, then stick with the 2.5" and don't run straight pipe.
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