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Old 20 April 2004, 09:09 PM
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toigye
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will putting a bigger backbox on affect power to my sti 8 and will i use more fuel
Old 20 April 2004, 11:41 PM
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evojkp
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Depending on backbox, it'll sound nicer, but I doubt that you'll use more fuel or gain anymore than 1 0r 2 horses.

For more power a full decat would be the order of the day.
Old 21 April 2004, 03:01 PM
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JIM THEO
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In my WRX03 when I changed the Scoobysport backbox for a STI8 I lost from 7-10ps measured with DeltaDash road dyno, so YES a "good" muffler gives some remarkable power but bear in mind the rest of my exhaust is already decated.
JIM
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