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To use your stock twin pop you need to do some custom piping to get them over to where the stock intercoolers are. Any muffler shop should be able to bent you some piping. The 2540 kit does bolt up just like the 2530 kit. Since it is a JDM spec kit, You will need to get the adapter for the supplied downpipes, the HKS 2530 kit is also missing these pipes. Power-wise, Bernie posted a Skyline Dyno that showed both the 2530 and 2540 curves. I would guess that the 2540 can make 20-30 more rwhp than the 2530 kit.
GT2530,2540 dyno Here is Bernie's post about them.
Later,
Chip
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