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Are we talking 4" or 5" UDP's?? Both are out there.
Also, I think I remember Raby commenting that the UDP was the one mod he found to produce hp... But only 5hp.
FWIW, I've had a 5" on my car for 43,000 miles & 5 autocross seasons.
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Rennzenn
Jfro@rennzenn.com
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