Those mufflers sell under a few different names for $279-$350 on eBay.
Yes, they are louder than stock. MUCH LOUDER. If you can live with the loudness, they sound awesome. There are also some concerns about exhaust drone at freeway speeds. Do a search on catback exhaust and you'll find lots of posts and info.
Yes, there is a small HP increase at the highest RPM's (I tested my Top Speed Pro 1 and here is a link to the dyno results: http://986forum.com/forums/general-discussions/51783-top-speed-pro-1-catback-exhaust-hp-increase.html)
 Manzo Stainless Steel Catback Exhaust Porsche 97-04 Boxster
 Beluga Racing Porsche 97-04 986 Boxster Performance Exhaust
 Top Speed Porsche 986 Boxster 97-04 Performance Exhaust
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 10-21-2016 at 08:17 PM.
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