12x7 apc 15%cool power os #8 plug 11,900 rtf ST header modified to fit OS bolt pattern, im sure ill get a couple hundred more rpm with the right header....on this header meant for a Super Tigre, doesn't quite line up to the exhaust port, restricting it a bit

what numbers can i expect on an ideally setup SF 61 and pipe wih a 12x7 APC? my figures seem very low