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Old 06-21-2018, 02:15 PM   #3
10/10ths
"50 Years of 550 Spyder"
 
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Join Date: Jun 2015
Location: The Road
Posts: 792
Consensus among the cognoscenti is that best power is obtained by cheap Chinese long tube headers with NO cats feeding secondary pipes with hi-flo cats wired up to send the proper OBD signal and then the muffler of your choice.
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