Hi Rob
I haven't made any comments to date, as here in Perth we don't have access to Smithy's, though I believe they are similar to what used to sell here as "Hot Dogs".
I must say that I agree with Paul and would mount the mufflers as far forward as possible and not worry about the cross over unless noise is an issue. The great thing about YBlocks is that they keep you guessing, as their exhaust note is so unique.
You need to keep in mind that the local boys in blue take an instant dislike to us Old Hoons, though I must say that I have driven with straight through mufflers with nary a second glance from the constabulary for years.
Looking forward to seeing the car in the flesh.
Regards
Rick - West Australia
Do Y Blocks Downunder run upside down? Gravity Sucks!!