Does a 4 into 1 pipe sound better?

[grog]

Yes, K Jetronic, that stuff was a headache. L Jetronic, much friendlier. Back then we were new at injection, had no choice but learn, was my trade. They built all that tech but bugger all diagnostics came with it. Todays much easier. 14 shouldve came with O2 sensor.

[Andre]

14 shouldve came with O2 sensor.

No thanks. I don't mind O2 sensor at all, as long as it is installed (and controlled) by me. If it came with the sensor, it would run in close loop up to mid-range rpm.

[Hooli]

Funny but to tune engines properly they still remove the O2 sensors from the system, they did on my HD last year.

Closed loop is normally great, with factory style restrictive exhausts.