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Anyone thought of putting a wider diameter exhaust system? (Exhaust manifold up to the back box) if so any sound difference? Or benefits? Just curious? TIA
 

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Back pressure my friend, that’s why it isn’t a good idea to go daft with exhausts on small engines, think of it as trying to blow through a straw to move a table tennis ball, you’re focusing the effort on one place, just blowing it without a straw hardly moves it, so how much effort would you need to give to make it move the same? Bit like a engine needs that pressure to make it work at its best. vx head office don’t spend years developing new engines to do more power with less fuel and last longer for the fun of it, back in the day a nova with 75 bhp was considered quick, and with 870 kg or whatever it was, it was. Now we want air con and electric windows, it’s all extra weight and a 1.2 in a corsa d does 80 bhp and feels like dead whale is in your boot.
 
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