I like my dad's 40 series on his 318 dakota.. 2.5 I believe off the manifolds to 3 inch.. I put on a 3.5 inch tip for him and it sounds better like that
it would be nice to sound more original.. like, say.. my exhuast (brushing off shoulder) but it sounds good and it's not really deafening inside when you are cruising down the highway.. the zuk actually is... at 60 you shout to have a conversation but it's all good, it's a gnarly beast.. it actually does hurt my ears cruising at 60 but I don't mind