Sorry to hijack the thread...
I have been curious for a while, what performance advantages can be seen from side pipes?
I believe Brocks Toranas all ran side pipes from 73, hence I would imagine their are some advantages..
I was out watching the NC race cars last weekend and saw a few of the XU1s running side pipes also. Obviously not the VETTE style with heat shields, but just the side flow sticking its nose beneath the drivers door.
Getting the pipe over the diff is generally the most restrictive area. Eliminating this is good.
When they refer to an opening it generally means an opening into the cabin, like a window or door, so there should be no need to weld the boot shut
I did ask that question, due to the boot having several openings into the boot it was deemed part of the cabin, so welding the holes in the rear bulkhead and parcel shelf may suffice.
Cheeer.