I'm in the process of pulling the stock twins, and for anyone that is using the stock twins and wants to keep them, I'd advise you pull them off anyway. I pulled the bottom exhaust pieces before the downpipe and there is a 4mm ring of gunk on the inside of the pipe. It looks like a freaking restrictor ring haha, I'll have to snap a couple pics.
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Daily: '99 Pontiac Trans Am. Projects: '96 S14, '87 Merkur XR4Ti
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