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      04-22-2008, 08:39 PM   #8
JohnnyTT
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Drives: 2011 X3 3.5
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Quote:
Originally Posted by Italteen3 View Post
Nope. :smile: It starts at 3" tapers down to 2.75" and then to 2.5". Has been proven to easily make 20+ whp. I believe some have shown close to 30whp with just these DPs!
Thanks for the info. 20+ is a lot. Is that with a tune??

Also, my question still stands though. Is having 3" -> 2.75" -> 2.5" still a waste? Because 2.5" will bottleneck the rest??? Isn't that the same as 2.5" all the way through?

I'm not doubting the performance gains, I'm just curious about the tech behind them.
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