Update Part B
I have long tube headers which are 1.5” primaries running to a 2” collector, these should give good flow whilst reducing back pressure, this then runs to 2.5” mufflers. So my theory is, as the exhaust gradually increases in diameter this causes a low(er) pressure area at the rear drawing the gases away from the engine??
The first real challenge was routing the exhaust around the panhard bar
so there was loads of this
and this
which resulted in this (can you spot the difference)
but it fits well
