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http://www.sound-performance.com/faq.htm#Q3

There are various threads in the General Forum on this site discussing these, too. Do some digging, most are fairly recent, within the last few days.

Techincally, an SP63 would be roughly equivalent to a Turbonetics T63 - in the real world, however, the porting and better exhaust housing means the SP63 makes more power yet spools faster.

-Pete
 
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