The LSA behaves the same regardless of what kind of cam it is. If the cam you have now was a 108 LSA it would be rattling the fenders- lots more lope to it. That cam you have would be more radical sounding if it was in a 350 engine instead of the 400. But overall, I like the sound of it.
I'd route the pipes out the back or side, though. Having them end under the car you might get a drone inside the car and the chance of carbon monoxide getting in the cabin is worse.