....except the TA 4x4, which only has a back-box, mounted transversely. I too would quite like a little more rasp to the exhaust and some of the 500 TA's on YouTube with cheeky replacements sound quite good. Not sure I need to commission a custom back-box fabrication just yet, but if done properly with bolt-up flanges, I could always quickly switch back to the original if I needed.....
.... bugger, that's started me off on a track I didn't need on a Monday - was adamant that I didn't want to modify this one too much