Yes, you can do that & did, but how LONG & what DIA."'s were/are the x 2 intermediate pipes ?? ,.& 2.5" dia all way back is V8 size: there's quite a large increase in crosssectional area going from 2" to 2.25" & even more going up from 2.25" to 2.5" ..Sure you'll get a bellowy exh note , do you...