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25 or 30 hp from downpipes over gutted precats. I doubt it. Well there is the 3 inch vs 2.5 inch testpipes also but I don't think that would be more than 1 or 2 hp. I'll be very happy with 20 over ungutted precats and maybe 10 over gutted precats. So it comes to a relatively high $ for hp mod but quicker spoolup, less weight, less heat near vital components... and just better engineering.
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