Originally Posted by wanker

None. Either upgrade will give you a 15 to 18 added hp over the OEM exhaust based on the typical dyno numbers. There are plenty of Top Speed Exhaust dyno threads on the forum. Thus, go with what you like.

BTW, just run a Google search of your question as it will pull up all the relevant forum threads. Works better than the forum search feature. https://www.google.com/search?ei=OVN....0.hVH5lCp7CDw