Excuse the dodgy pics, but just checked my genuine Akra/M Perf tips. The inlet is 70mm, length 160mm. It looks like 71-2mm in the pic but there is another ring part inside that reduces it further by 1-2mm, therefore the outlets on the exhaust are 70mm. The outlets on the Akra are slightly further apart than the standard system, so you can fit 100mm tips with a gap between. You can’t go bigger than 90mm with standard system without the two tips clashing.
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