I dont know the part number but I do know that the "street" mufflers from Spintech are extremely loud. Alot louder than a 2 chamber Flowmaster. I got the GSM true duals w/o cats installed this week and it is obnoxious at WOT. Im propably gonna add a pair of high flow cats to this system to quiet it down. If that doesnt help then Im gonna pull the Spintechs off and put on a pair of 3 chamber Flomasters or some Magnaflow mufflers.
yeah i am actually running a single in dual out spintech right now minus the third cat and its freakin loud. but i was wanting to order the long tube headers from KRC and use the loud race mufflers that GSM uses. i've browsed the spintech webiste but i dont' know which ones that Scott over at GMS uses for his setup. i would just buy his whole kit but i don't think it would fit with the long tube headers.