Thread: 3" exhaust question

No. It's not at all like a header in that way. Myth, all the way.

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And so it comes out :flamesuit on:
Good thing I didnt make that claim, or I'd have a dyno sheet jammed up my arse
I've been in a na sr20de with 3" and my 2.5 does sound much nicer for a DD, and that's my primary basis on my 'bad idea' comment - I'd like not to have the police checking out my vehicle because I vibrated the coffee in their mug at the donut shop.

Go look for a head-to-head dyno of an engine with a header and no exhaust (or a dump pipe) and with a full exhaust. This is the extreme example of what you're after, and you'll be able to see no low end power was lost. There should be gains everywhere.

I have always read that 2.5 was the best for N/A i mean stuff changes over the years so that could be outdated info now

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^BINGO! If I ran 3", I would run the Magnaflow Resonator #12640 for sound control only! Char is right. If anybody around says different, you are talking like a rookie.

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Regarding exhaust size and noise levels:


Source: e30tech.com Forums - View Single Post - Exhaust size discussion

The stock exhaust system (which is on there now) is terrible for performance too, how much worse can this be? I'm preparing for turbo, just trying to get an idea of what kind of performance gains and/or losses there are going to be and any input on the parts I have selected.