Cleaning sale
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Right, I understand that, but the old GGB pages that I can still find list both a 3.5" and a 4". I suspect that the 3.5" is designed for a fully jacketed dry 4" exhaust that actually has a 3.5" inner pipe - is that correct? So if that is the case, as the seller stated, they probably aren't designed to fit in a standard 4" exhaust tip. It sounds like if they were bolted into a set of 4" tips, they would fit but they would be off center.